A264427 Number of (6+1)X(n+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.

3, 1462, 44264, 2486429, 147984724, 7577203142, 396849643846, 20924743041507, 1094394105909728

Offset

1,1

Comments

Row 6 of A264422.

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=3
..9..6.11..5....5..6..1..2....5..6..7..2....9..6..7..2....9..0..7..5
..0..1..2..3....9.10.11..3....9..1.15..3....0..1.11..3...13..1..2..3
..4..8.15..7....4.18..0..7....4.14..0.10....4..5.19.10....4.14..6.10
.21.22.10.14....8.12.19.14...21.22.23.11....8.18.23.14....8.18.23.11
.12.13.17.18...21.13.23.15...12.13..8.18...12.22.27.15...12.22.27.15
.25.26.27.19...25.17.27.22...25.26.27.19...25.17.21.13...25.26.24.19
.20.24.16.23...20.24.16.26...20.24.16.17...20.24.16.26...20.21.16.17

Crossrefs

Cf. A264422.

Sequence in context: A119111 A233195 A219783 * A285656 A239503 A118050

Adjacent sequences: A264424 A264425 A264426 * A264428 A264429 A264430

Keyword

nonn

Author

R. H. Hardin, Nov 12 2015

Status

approved