A264372 Number of (n+1)X(n+1) arrays of permutations of 0..(n+1)^2-1 with each element having directed index change 2,-2 -1,0 -1,2 1,0 or 0,-1.

1, 1, 80, 3778, 1742881, 2546661201, 16353452350876, 411980921235969243

Offset: 1

Author

R. H. Hardin, Nov 12 2015

Keywords

• nonn

Comments

Diagonal of A264379.

Examples

			Some solutions for n=4
..5..2..3..4..7....1..2..5..6..9....1..2..5..8..9....1..6..5..8..9
..0..1.10.11.12....0..7.10..3..4....0..7.10..3.12....0..7.10..3..4
.15..6.13.18..9...15.12.13..8.17...11..6..4.14.17....2.16.15.18.17
.16..8.20.23.14...20.11.18.23.22...16.21.20.13.24...20.11.12.13.14
.21.22.17.24.19...21.16.14.24.19...15.22.23.18.19...21.22.23.24.19
		

Crossrefs

Cf. A264379.