A264371 Number of (7+1)X(n+1) arrays of permutations of 0..n*8+7 with each element having directed index change 0,0 0,2 1,0 or -1,-2.

1, 277, 76729, 3204336, 133818624, 7767356736, 450847788304, 24315232188224, 1311374995519744, 71269232804067408

Offset

1,2

Comments

Row 7 of A264364.

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=3
..6..1..2..3....0..1..2..3....0..7..2..1....0..1..2..3....6..7..2..3
..0..5..4..7....4.11..6..7...10.11..6..3...10.11..4..5....0..1..4..5
.14..9..8.11...14..5.10..9....4..5..8..9....8.15..6..7....8..9.10.11
.18.13.10.15....8.19.12.13...12.13.14.15...12..9.14.13...18.13.12.15
.12.23.16.19...22.23.18.15...22.17.16.19...22.17.16.19...16.23.14.17
.20.17.22.21...16.17.20.21...20.27.18.21...20.27.18.23...26.21.20.19
.30.31.26.27...30.31.26.27...30.25.24.23...30.21.26.25...24.25.22.27
.24.25.28.29...24.25.28.29...28.29.26.31...24.29.28.31...28.29.30.31

Crossrefs

Cf. A264364.

Sequence in context: A236803 A048525 A189609 * A154231 A252249 A257368

Adjacent sequences: A264368 A264369 A264370 * A264372 A264373 A264374

Keyword

nonn

Author

R. H. Hardin, Nov 12 2015

Status

approved