A264627 Number of (n+1)X(7+1) arrays of permutations of 0..n*8+7 with each element having directed index change -2,0 -1,0 0,-1 or 1,1.

0, 76, 1200, 13556, 349391, 7907841, 145801320, 2739867178, 54011094032, 1041910674136, 19735900374844, 375966942137013, 7191151172715700, 137027122103977880, 2605652234584032150, 49595770201824007656

Offset

1,2

Comments

Column 7 of A264628.

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

Some solutions for n=4
.16.17..3.11.12..6..7.15....1.17..3.11.12..6..7.15....1..2..3..4..5..6..7.23
..9..0..1..2.28..4..5.23...24..0.26..2.13..4..5.31....9..0.26.27.13.14.15.31
.32..8.34.10.21.22.13.14...32..8..9.10.28.29.23.14...32..8.34.10.11.12.38.39
.25.26.27.18.19.20.31.39...25.16.27.18.19.20.21.22...25.16.17.18.19.20.21.22
.33.24.35.36.37.38.29.30...33.34.35.36.37.38.39.30...33.24.35.36.37.28.29.30

Crossrefs

Cf. A264628.

Sequence in context: A156388 A156396 A233365 * A136539 A267797 A163710

Adjacent sequences: A264624 A264625 A264626 * A264628 A264629 A264630

Keyword

nonn

Author

R. H. Hardin, Nov 19 2015

Status

approved