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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. 1
569, 18995, 474101, 14115520, 452888405, 14143461755, 445447784440, 14172257092592, 454737017844040, 14624541206729483, 472474884440064077, 15320841681004133632, 498414099492357284253, 16258226314270163231635 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 2 08:07 EDT 2022. Contains 357191 sequences. (Running on oeis4.)