A263705 Number of (n+2)X(2+2) arrays of permutations of 0..n*4+7 with each element moved 0 or 1 knight moves and equal numbers of elements advancing and retreating in the array numbered in row major order.

475, 18995, 437533, 13341380, 414860767, 13151405753, 409464954596, 13041097884324, 416984172658896, 13411256346548047, 432777590466469475, 14030980958229441618, 456328306237092974195, 14885590516436588260515

Offset

1,1

Comments

Column 2 of A263706.

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

Example

Some solutions for n=2
..0..1.11.10....0.10..4..3....9..1..2..5....6..8..4.10....0..1..2..5
..4..5.13..7....2.12..6.14...13..3..6.14....2..3..0.14....4.12..6..7
.14..9..3..2....8.15..1.13....8..0.10.11....1.15.12.13....8.15..3.11
.12..6..8.15....5.11..7..9...12..4..7.15....5.11..7..9...10.13.14..9

Crossrefs

Cf. A263706.

Sequence in context: A252518 A365871 A210048 * A048428 A253395 A171077

Adjacent sequences: A263702 A263703 A263704 * A263706 A263707 A263708

Keyword

nonn

Author

R. H. Hardin, Oct 24 2015

Status

approved