A264555 Number of (6+1)X(n+1) arrays of permutations of 0..n*7+6 with each element having directed index change -1,1 -1,2 1,0 or 0,-1.

0, 44, 400, 4640, 105081, 1994830, 29691127, 480994368, 8117368800, 132754460552, 2133045608920, 34553147199456, 560889832726788, 9059789552261840, 146150531190902752, 2359511442598185984, 38084486000051713136

Offset

1,2

Comments

Row 6 of A264550.

Links

R. H. Hardin, Table of n, a(n) for n = 1..190

Example

Some solutions for n=4
..1..5..6..4..8....1..2..6..4..8....1..2..3..7..8....1..2..3..4..7
..0..7..2..3.13....0..7.11..3.13....0.10.11.12..4....0.10.11..9.12
.11.15.16.14..9....5.12.16.14..9....5..6.13.14..9....5..6.15..8.18
.10.20.12.19.23...10.17.21.19.22...16.17.21.19.22...16.17.20.13.14
.21.22.17.18.28...15.25.26.18.28...15.25.26.18.27...21.22.23.27.19
.26.27.30.31.24...20.27.30.23.24...20.30.28.23.24...26.30.28.31.24
.25.32.33.34.29...31.32.33.34.29...31.32.33.34.29...25.32.33.34.29

Crossrefs

Cf. A264550.

Sequence in context: A190420 A228464 A190605 * A231217 A250336 A250337

Adjacent sequences: A264552 A264553 A264554 * A264556 A264557 A264558

Keyword

nonn

Author

R. H. Hardin, Nov 17 2015

Status

approved