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A264621 Number of (n+1)X(n+1) arrays of permutations of 0..(n+1)^2-1 with each element having directed index change -2,0 -1,0 0,-1 or 1,1. 0
0, 2, 13, 108, 6107, 604916, 145801320, 84594500932, 123016783664393 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A264628. Some solutions for n=4

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

..1.11..7..4..9....1..2.12..4.14....5..2..3..4.14....1..2..3..4..9

..6..0.12..2..3...15..0.17..9..3...10..0..1..9.19...15..0.12.13.14

.20..5.13.14..8...20..5..6..7..8...15.12..6..7..8...20..5..6..7..8

.16.10.22.19.24...16.10.11.19.13...20.17.11.23.13...16.10.11.19.24

.21.15.23.17.18...21.22.23.24.18...21.22.16.24.18...21.22.23.17.18

CROSSREFS

Cf. A264628.

Sequence in context: A199124 A069100 A031991 * A245806 A192204 A176932

Adjacent sequences:  A264618 A264619 A264620 * A264622 A264623 A264624

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 19 2015

STATUS

approved

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Last modified July 24 04:25 EDT 2021. Contains 346273 sequences. (Running on oeis4.)