A209541 Number of nX6 array permutations with every element making zero or one right-handed knight moves (out 2, right 1)

1, 16, 1125, 63504, 2080800, 92160000, 4045204800, 171889843216, 7330747451944, 316825404168100, 13575541351218337, 583084349120160000, 25065468339217054272, 1077387582576682598400, 46295580843818152835625

Offset

1,2

Comments

Column 6 of A209543

Links

R. H. Hardin, Table of n, a(n) for n = 1..132

Example

Some solutions for n=4
..0..9.13.11..4..5....0..1.13..3..4.16....0.12.10.14..4..5....8..1..2.11.15..5
..6..7..8..1..2.22....6..7.19..9..2.11....6..7.16.20.21.22....6.18..0.20.10..3
.20.21..3.23.16.17...20.21.22.23..5.17....1..2..3.15..8.17...12.21.22..4.16.17
.18.19.12.10.14.15...18..8.12.10.14.15...18.19..9.13.11.23....7.19..9.13.14.23

Crossrefs

Sequence in context: A210822 A265622 A144915 * A279295 A353029 A053903

Adjacent sequences: A209538 A209539 A209540 * A209542 A209543 A209544

Keyword

nonn

Author

R. H. Hardin Mar 10 2012

Status

approved