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A181961
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Number of independent sets of nodes in graph C_6 x P_n (n>=0).
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2
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1, 18, 199, 2309, 26660, 307983, 3557711, 41097664, 474748249, 5484153915, 63351353194, 731816432741, 8453730886601, 97655043951558, 1128082705387895, 13031283779122753, 150533605489179940, 1738920490541077131, 20087504465180492695, 232045017488460324836
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = 12*a(n-1)-3*a(n-2)-25*a(n-3)-2*a(n-4)+a(n-5) for n>=5, with a(0)=1, a(1)=18, a(2)=199, a(3)=2309, a(4)=26660.
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PROG
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CROSSREFS
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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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