A264549 Number of (n+1)X(7+1) arrays of permutations of 0..n*8+7 with each element having directed index change -1,1 -1,2 1,0 or 0,-1.

3, 240, 2728, 66372, 1573479, 29691127, 591482528, 11959837149, 234588752099, 4630258704238, 91650397488268, 1806082543597960, 35618855441537594, 702809886558706588, 13858157412186691169, 273285931814164349815

Offset

1,1

Comments

Column 7 of A264550.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..1..2..9..4.10..6.12.14....1..2..8..9..5..6.12.13....1..2..3..9.10..6.13.14
..0.16.17..3.13..5.21..7....0.10.16..3..4.20.15..7....0.16.17.12..4..5.15..7
..8.18.24.11.27.22.29.15...17.18.19.11.21.22.14.29....8.18.19.11.21.27.29.30
.25.26.32.19.20.30.37.23...25.32.33.28.35.30.36.23...25.32.33.28.20.35.22.23
.33.34.35.36.28.38.39.31...24.34.26.27.37.38.39.31...24.34.26.36.37.38.39.31

Crossrefs

Cf. A264550.

Sequence in context: A157723 A342631 A142730 * A024044 A356568 A069640

Adjacent sequences: A264546 A264547 A264548 * A264550 A264551 A264552

Keyword

nonn

Author

R. H. Hardin, Nov 17 2015

Status

approved