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A298026
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Coordination sequence of Dual(3.6.3.6) tiling with respect to a hexavalent node.
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22
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1, 6, 6, 18, 12, 30, 18, 42, 24, 54, 30, 66, 36, 78, 42, 90, 48, 102, 54, 114, 60, 126, 66, 138, 72, 150, 78, 162, 84, 174, 90, 186, 96, 198, 102, 210, 108, 222, 114, 234, 120, 246, 126, 258, 132, 270, 138, 282, 144, 294, 150, 306, 156, 318, 162, 330, 168, 342, 174, 354, 180, 366, 186, 378, 192, 390
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OFFSET
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0,2
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COMMENTS
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Also known as the kgd net.
This is one of the Laves tilings.
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LINKS
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FORMULA
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a(0)=1; a(2*k)=6*k, a(2*k+1)=12*k+6.
a(n) = 3*n for n>0 and even.
a(n) = 6*n for n odd.
a(n) = 2*a(n-2) - a(n-4) for n>4.
(End)
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MAPLE
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f6:=proc(n) if n=0 then 1 elif (n mod 2) = 0 then 3*n else 6*n; fi; end;
[seq(f6(n), n=0..80)];
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MATHEMATICA
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Join[{1}, LinearRecurrence[{0, 2, 0, -1}, {6, 6, 18, 12}, 80]] (* Jean-François Alcover, Mar 23 2020 *)
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PROG
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(PARI) Vec((1 + 6*x + 4*x^2 + 6*x^3 + x^4) / ((1 - x)^2*(1 + x)^2) + O(x^60)) \\ Colin Barker, Jan 22 2018
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CROSSREFS
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List of coordination sequences for Laves tilings (or duals of uniform planar nets): [3,3,3,3,3.3] = A008486; [3.3.3.3.6] = A298014, A298015, A298016; [3.3.3.4.4] = A298022, A298024; [3.3.4.3.4] = A008574, A296368; [3.6.3.6] = A298026, A298028; [3.4.6.4] = A298029, A298031, A298033; [3.12.12] = A019557, A298035; [4.4.4.4] = A008574; [4.6.12] = A298036, A298038, A298040; [4.8.8] = A022144, A234275; [6.6.6] = A008458.
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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