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A223230 Rolling icosahedron footprints: number of n X 5 0..11 arrays starting with 0 where 0..11 label vertices of an icosahedron and every array movement to a horizontal, diagonal or antidiagonal neighbor moves along an icosahedral edge. 1

%I

%S 625,75665,11043445,1697263985,266409703885,42210625593305,

%T 6716507564288245,1070788920090847265,170861214141424879645,

%U 27274345271819338522025,4354541372254902852256645

%N Rolling icosahedron footprints: number of n X 5 0..11 arrays starting with 0 where 0..11 label vertices of an icosahedron and every array movement to a horizontal, diagonal or antidiagonal neighbor moves along an icosahedral edge.

%C Column 5 of A223233.

%H R. H. Hardin, <a href="/A223230/b223230.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 251*a(n-1) -15873*a(n-2) +195175*a(n-3) +2042368*a(n-4) -47798442*a(n-5) +263976930*a(n-6) -451699632*a(n-7) -350892000*a(n-8) +1964608344*a(n-9) -2144659680*a(n-10) +765275040*a(n-11).

%e Some solutions for n=3

%e ..0..2..4.10..4....0..5..0..2..4....0..6..2..0..1....0..5..6..0..2

%e ..6..2..6.10.11....6..2..6..2..6....0..6..2..8..2....6..2..6..4..6

%e ..1..0..6.10..5....1..0..1..2..0....0..6..2..1..2....6..0..6..2..6

%e Vertex neighbors:

%e 0 -> 1 2 5 6 7

%e 1 -> 0 2 3 7 8

%e 2 -> 0 1 4 6 8

%e 3 -> 1 7 8 9 11

%e 4 -> 2 6 8 9 10

%e 5 -> 0 6 7 10 11

%e 6 -> 0 2 4 5 10

%e 7 -> 0 1 3 5 11

%e 8 -> 1 2 3 4 9

%e 9 -> 3 4 8 10 11

%e 10 -> 4 5 6 9 11

%e 11 -> 3 5 7 9 10

%Y Cf. A223233.

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 18 2013

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Last modified October 25 17:22 EDT 2021. Contains 348255 sequences. (Running on oeis4.)