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 A223203 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 0
 1, 15, 657, 90111, 39868737, 57728430255, 275769851453745, 4367470887097715487, 230051556728875753924449, 40390820217552511124819066703 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A223209 LINKS EXAMPLE 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 CROSSREFS Sequence in context: A092958 A222268 A280179 * A279465 A349889 A279531 Adjacent sequences:  A223200 A223201 A223202 * A223204 A223205 A223206 KEYWORD nonn AUTHOR R. H. Hardin Mar 18 2013 STATUS approved

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Last modified May 17 17:52 EDT 2022. Contains 353778 sequences. (Running on oeis4.)