A223485 Rolling icosahedron face footprints: number of 7Xn 0..19 arrays starting with 0 where 0..19 label faces of an icosahedron and every array movement to a horizontal or antidiagonal neighbor moves across an icosahedral edge.

64000000, 1594323, 102515625, 6591796875, 563999907825, 48783753036675, 4468456626780825, 409807503225524475, 38120535124295537025, 3545335226678204077875, 330863549667143315488425

Offset: 1

Author

R. H. Hardin Mar 20 2013

Keywords

• nonn

Comments

Row 7 of A223480

Examples

			Some solutions for n=3
..0..5..0....0..5..0....0..5..0....0..5..0....0..5..0....0..5..0....0..5..0
..0..1..0....0..1..0....0..1..0....0..1..0....0..1..0....0..1..0....0..1..0
..0..1..0....0..1..0....0..1..0....0..1..0....0..1..0....0..1..0....0..1..4
..0..5..7....4..1..4....4..1..6....4..1..4....6..1..4....4..1..6....4.17..4
..7..5..7....6..1..0....6..7..5....6..1..6....6..1..6....0..1..4....4..3.16
..9..5..7....0..5..9...11..7.11....0..1..0....0..1..0....4.17.18....2..3..4
..0..5..9....9.14.11...11.12.10....6..1..0....0..5..9....4.17.10...16..3..2
Face neighbors:
0 -> 1 2 5
1 -> 0 4 6
2 -> 0 3 8
3 -> 2 4 16
4 -> 3 1 17
5 -> 0 7 9
6 -> 1 7 10
7 -> 6 5 11
8 -> 2 9 13
9 -> 8 5 14
10 -> 6 12 17
11 -> 7 12 14
12 -> 11 10 19
13 -> 8 15 16
14 -> 9 11 15
15 -> 14 13 19
16 -> 3 13 18
17 -> 4 10 18
18 -> 16 17 19
19 -> 15 18 12
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..36