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%I #5 Dec 18 2015 18:18:29
%S 1,15,657,90111,39868737,57728430255,275769851453745,
%T 4367470887097715487,230051556728875753924449,
%U 40390820217552511124819066703
%N 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
%C Diagonal of A223209
%e Some solutions for n=3
%e ..0..2..0....0..5..7....0..5..0....0..5..0....0..5..7....0..2..0....0..1..6
%e ..1..0..2....5..0..5....2..0..5....5..0..5....5..7.11....2..3..2....1..0..1
%e ..0..5..0....0..5..9....0..2..0....0..5..7....7.11.12....8..2..3....6..1..6
%e Face neighbors:
%e 0 -> 1 2 5
%e 1 -> 0 4 6
%e 2 -> 0 3 8
%e 3 -> 2 4 16
%e 4 -> 3 1 17
%e 5 -> 0 7 9
%e 6 -> 1 7 10
%e 7 -> 6 5 11
%e 8 -> 2 9 13
%e 9 -> 8 5 14
%e 10 -> 6 12 17
%e 11 -> 7 12 14
%e 12 -> 11 10 19
%e 13 -> 8 15 16
%e 14 -> 9 11 15
%e 15 -> 14 13 19
%e 16 -> 3 13 18
%e 17 -> 4 10 18
%e 18 -> 16 17 19
%e 19 -> 15 18 12
%K nonn
%O 1,2
%A _R. H. Hardin_ Mar 18 2013
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