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A223203
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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 vertical neighbor moves across an icosahedral edge
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0
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..2..0....0..5..7....0..5..0....0..5..0....0..5..7....0..2..0....0..1..6
..1..0..2....5..0..5....2..0..5....5..0..5....5..7.11....2..3..2....1..0..1
..0..5..0....0..5..9....0..2..0....0..5..7....7.11.12....8..2..3....6..1..6
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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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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