A263704 Number of (n+2)X(1+2) arrays of permutations of 0..n*3+5 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.

49, 569, 4020, 38769, 355145, 3191484, 28681889, 268042897, 2478073156, 22988521889, 213950264057, 2003893119428, 18784066433049, 176529658989177, 1662415131728836, 15693860548449185, 148415319869511929

Offset

1,1

Comments

Column 1 of A263706.

Links

R. H. Hardin, Table of n, a(n) for n = 1..98

Example

Some solutions for n=4
..0..1..3....7..8..2....0..8..2....0..1..2....5..1..2....5..6..2....0..8..3
..2.11..6....3..4..5....3..9.10....3..4.10...10..4..0....3..4..0....2..4..6
..5.12..9...13..0..1...11..7..1....6..7.13...13.14..9....1..7.13....5..7..1
..8.15..4...14.15.11....4..5..6...16..5.11...16..3..6...16.10.11...16.10.11
..7.13.14...17..6..9...12.13.14...17..8.15...12..8..7...12..8.14...17.13.15
.10.16.17...10.16.12...15.16.17...14..9.12...15.11.17...15..9.17...14..9.12

Crossrefs

Cf. A263706.

Sequence in context: A030510 A104935 A110203 * A166832 A299711 A175775

Adjacent sequences: A263701 A263702 A263703 * A263705 A263706 A263707

Keyword

nonn

Author

R. H. Hardin, Oct 24 2015

Status

approved