A264654 Number of (n+1)X(7+1) arrays of permutations of 0..n*8+7 with each element having directed index change 1,1 2,2 -1,0 or 0,-1.

0, 84, 628, 14871, 406871, 7644038, 159104356, 3198623964, 62394318265, 1226341881232, 23865210447004, 463265360326485, 8996662976945515, 174361240864244092, 3378409196048079878, 65452846370331638932

Offset

1,2

Comments

Column 7 of A264655.

Links

R. H. Hardin, Table of n, a(n) for n = 1..191

Example

Some solutions for n=4
..8..2..3..4.12.13..7.15....1..9.10.11..5..6..7.15....1..2.10..4.12..6..7.15
..9.17..1.19.20.14..5..6...16..0.18.12.13..4.22.23...16..0.18.19..3.14..5.23
.24.25..0.10.11.22.23.31...24.25.19.27..2..3.30.14...24..8..9.20.11.29.13.31
.32.16.27.18.36.30.38.39...32.26..8.28.36.20.31.39...32.26.27.35.36.30.38.22
.33.34.35.26.37.28.29.21...33.34.35.17.37.38.29.21...33.34.25.17.37.28.39.21

Crossrefs

Cf. A264655.

Sequence in context: A175813 A238523 A238518 * A230907 A220016 A219827

Adjacent sequences: A264651 A264652 A264653 * A264655 A264656 A264657

Keyword

nonn

Author

R. H. Hardin, Nov 20 2015

Status

approved