A263708 Number of (2+2) X (n+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.

569, 18995, 474101, 14115520, 452888405, 14143461755, 445447784440, 14172257092592, 454737017844040, 14624541206729483, 472474884440064077, 15320841681004133632, 498414099492357284253, 16258226314270163231635

Offset

1,1

Comments

Row 2 of A263706.

Links

R. H. Hardin, Table of n, a(n) for n = 1..17

Example

Some solutions for n=2
..0.10..2..3....0.10..9..3....0..8..9..3....9..1..4.10....6..8..4..3
.13.14..6..7...13.12..6.14...13.12..6..7....2.12..0..7....2.12.15..7
..1.15.12.11....8..2..1.11....1..2.10.11...14.15..3.11....1..0.10.13
..5..4..8..9....5..4..7.15....5..4.14.15....5.13..8..6....5.11.14..9

Crossrefs

Cf. A263706.

Sequence in context: A142818 A103818 A240715 * A219992 A221218 A252465

Adjacent sequences: A263705 A263706 A263707 * A263709 A263710 A263711

Keyword

nonn

Author

R. H. Hardin, Oct 24 2015

Status

approved