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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

Table of n, a(n) for n=1..10.

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.)