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A223180 Rolling icosahedron footprints: number of n X n 0..11 arrays starting with 0 where 0..11 label vertices of an icosahedron and every array movement to a horizontal, vertical or antidiagonal neighbor moves along an icosahedral edge 0
1, 20, 400, 14560, 1018720, 141047120, 39288329040, 22231433842560, 25710310945249680, 61010814457361940400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A223186

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

..0..7..1....0..5..7....0..1..7....0..1..7....0..2..6....0..7..1....0..7.11

..5..0..7....7..0..1....7..3.11....7..3..1....6..4..2....5..0..7....1..3..7

..7..1..3....1..7..3...11..7..5....1..8..3....2..6..4....7..5.11....7..1..0

Vertex neighbors:

0 -> 1 2 5 6 7

1 -> 0 2 3 7 8

2 -> 0 1 4 6 8

3 -> 1 7 8 9 11

4 -> 2 6 8 9 10

5 -> 0 6 7 10 11

6 -> 0 2 4 5 10

7 -> 0 1 3 5 11

8 -> 1 2 3 4 9

9 -> 3 4 8 10 11

10 -> 4 5 6 9 11

11 -> 3 5 7 9 10

CROSSREFS

Sequence in context: A006494 A007545 A055476 * A041181 A041762 A196740

Adjacent sequences:  A223177 A223178 A223179 * A223181 A223182 A223183

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 18 2013

STATUS

approved

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Last modified October 21 13:05 EDT 2018. Contains 316422 sequences. (Running on oeis4.)