A264525 Number of (7+1)X(n+1) arrays of permutations of 0..n*8+7 with each element having directed index change -1,0 0,2 -1,-2 or 1,0.

1, 46, 2116, 65182, 2007889, 50099452, 1250046736, 33040712340, 873318285225, 23316358581360, 622513677650176, 16358436196050416, 429867558557693881

Offset

1,2

Comments

Row 7 of A264520.

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for n=4
..7..6..0..8..2....5..6..7..8..2....7..6..9..1..2....7..6..9..1..2
.10..1.14..3..4....0..1.12..3..4....0.11.12..3..4....0.13..5..3..4
..5.18.19.11..9...17.16.19.11..9....5.18.10..8.19...17.18.19..8.12
.22.21.12.13.17...10.23.22.13.14...22.23.15.13.14...10.11.22.16.14
.15.16.27.28.29...15.28.27.18.29...25.16.17.28.29...15.26.27.21.29
.20.33.25.23.24...20.21.25.26.24...20.21.34.26.24...20.33.25.23.24
.35.26.37.38.39...37.36.39.38.32...35.36.27.38.39...35.38.37.28.39
.30.31.32.36.34...30.31.35.33.34...30.31.32.33.37...30.31.32.36.34

Crossrefs

Cf. A264520.

Sequence in context: A223721 A223827 A223785 * A223971 A009990 A042013

Adjacent sequences: A264522 A264523 A264524 * A264526 A264527 A264528

Keyword

nonn

Author

R. H. Hardin, Nov 16 2015

Status

approved