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A264501
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Number of (n+1)X(3+1) arrays of permutations of 0..n*4+3 with each element having directed index change -1,1 0,-1 0,1 or 1,0.
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1
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3, 14, 46, 149, 524, 1790, 6084, 20812, 71127, 242856, 829559, 2833848, 9679612, 33063445, 112939275, 385778601, 1317744028, 4501163516, 15375113297, 52518432516, 179392903112, 612771784386, 2093110937380, 7149665753285
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 5*a(n-2) +17*a(n-3) +22*a(n-4) +5*a(n-5) -29*a(n-6) -44*a(n-7) -25*a(n-8) +11*a(n-9) +20*a(n-10) +11*a(n-11) -a(n-12) -2*a(n-13) -a(n-14)
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EXAMPLE
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Some solutions for n=4
..1..4..3..2....1..2..3..6....1..0..3..6....1..4..3..2....1..2..5..6
..0..8..5..6....0..8..9.10....5..4..2.10....0..8..7.10....0..8..7..3
..9.10.11..7....4..5.11..7....9.12.13..7....9..5..6.14....4.12..9.14
.13.16.17.14...13.16.17.14....8.14.15.11...13.12.15.11...13.16.10.11
.12.18.19.15...12.18.19.15...17.16.19.18...17.16.19.18...17.18.19.15
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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