A223232 Rolling icosahedron footprints: number of nX7 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.

15625, 7540985, 5127809545, 3843057179285, 3010781803380625, 2410480042269361205, 1952463524081506924645, 1591754706579747811787945, 1302463364554005567144837065, 1067991482533134242042535939665

Offset: 1

Author

R. H. Hardin Mar 18 2013

Keywords

• nonn

Comments

Column 7 of A223233

Examples

			Some solutions for n=3
..0..6..0..6..0..6..0....0..6..0..5..0..1..2....0..6..0..6..4..8..2
..0..6..0..6..0..7..0....0..6..0..6..0..6..2....0..6..0..6..2..8..3
..0..6..0..1..0..2..0....0..6..0..6..5..6..0....0..6..0..6..2..8..1
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
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..110