A264669 Number of (n+1)X(n+1) arrays of permutations of 0..(n+1)^2-1 with each element having directed index change -1,-1 1,0 -1,-2 -2,-2 or 0,1.

0, 2, 34, 890, 123222, 43095017, 40765995197, 117336061482333

Offset

1,2

Comments

Diagonal of A264676.

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=4
..6..0..8..9..3....6.13..1..2..3....6..0..1..9..3....7.13..1..2..3
.17..1..2..7..4....0.12.14..7..4...12..5..2..7..4....0.12..6.14..4
..5.10.19.12.13....5.10.11..8..9...17.18.11..8.13....5.17.19..8..9
.22.11.16.24.14...21.23.16.24.18...10.23.16.24.14...10.11.16.24.18
.15.20.21.18.23...15.20.17.22.19...15.20.21.22.19...15.20.21.22.23

Crossrefs

Cf. A264676.

Sequence in context: A361773 A224882 A227935 * A367510 A187546 A195005

Adjacent sequences: A264666 A264667 A264668 * A264670 A264671 A264672

Keyword

nonn

Author

R. H. Hardin, Nov 20 2015

Status

approved