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A223276 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, diagonal or antidiagonal neighbor moves across an icosahedral edge 0
1, 15, 849, 72279, 28271577, 20570223999, 72981761306721, 449769396657137031, 15458246910651549408393, 798321445297149167278062831 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A223282

LINKS

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

EXAMPLE

Some solutions for n=3

..0..2..3....0..5..0....0..2..8....0..1..4....0..2..3....0..2..0....0..5..9

..0..2..8....9..5..7....0..2..8....4..1..6....3..2..0....3..2..3....0..5..7

..3..2..0....9..5..9....3..2..0....6..1..6....3..2..0....8..2..8....0..5..7

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: A205432 A020240 A281695 * A233019 A270962 A223818

Adjacent sequences:  A223273 A223274 A223275 * A223277 A223278 A223279

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 19 2013

STATUS

approved

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Last modified September 26 16:43 EDT 2020. Contains 337374 sequences. (Running on oeis4.)