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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
0
1, 27, 2025, 421875, 288507825, 622332801675, 4468456626780825, 104443823338086658275, 8163685522687864520397825, 2101858460730043160691131026875
OFFSET
1,2
COMMENTS
Diagonal of A223480
EXAMPLE
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
CROSSREFS
Sequence in context: A211926 A304119 A017199 * A013779 A075081 A017307
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 20 2013
STATUS
approved