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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.
1
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 24 2015
STATUS
approved