A264421 Number of (n+1)X(6+1) arrays of permutations of 0..n*7+6 with each element having directed index change 0,1 2,2 1,0 -1,2 -2,-1 or -1,-1.

0, 385, 15088, 1103666, 95946259, 7577203142, 577598946184, 44052069039720

Offset

1,2

Comments

Column 6 of A264422.

Links

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

Example

Some solutions for n=3
.15..9..7..2.12..4..5....8..9.10.11.12..4..5....8..9..1.18.12..4..5
..0..1.17..3.19.20..6....0.16.24..3.19.20..6....0.16..2..3.19.20..6
.22..8.24.25.11.27.13....7.23.21..1..2.27.13....7.23.21.25.11.27.13
.14.21.16.23.18.10.26...14.15.22.17.18.25.26...14.15.22.17.24.10.26

Crossrefs

Cf. A264422.

Sequence in context: A351696 A204712 A237102 * A063390 A130612 A060721

Adjacent sequences: A264418 A264419 A264420 * A264422 A264423 A264424

Keyword

nonn

Author

R. H. Hardin, Nov 12 2015

Status

approved