A223476 Rolling icosahedron face footprints: number of n X n 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.
1, 27, 2025, 421875, 288507825, 622332801675, 4468456626780825, 104443823338086658275, 8163685522687864520397825, 2101858460730043160691131026875
Offset: 1
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Examples
Some solutions for n=3 ..0..1..0....0..2..8....0..2..8....0..2..8....0..2..8....0..2..8....0..2..8 ..0..5..7....8..9.14....0..2..3....0..2..8....0..2..0....3..2..8....8..2..3 ..7..5..9...14.11..7....3..4.17....8..2..8....3..2..0....3..2..3....3..4..3 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
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