A189149 Number of nX6 array permutations with each element making zero or one knight moves

1, 81, 42689, 20037184, 5025299720

Offset

1,2

Comments

Column 6 of A189150

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for 3X6
..0.12.10..3..4.16...13.12..6.16.17..9....8..9..6..3..4.16....0..1.15.11.17..5
..2..7..8.17.14.15...14..7..0..1.10.15...14..7.12.13..2.15...14..7..8.13.10..3
..1.13..6.11..5..9....8..2..3.11..5..4....1..0.10.11..5.17...12..9..6..2.16..4

Crossrefs

Sequence in context: A017308 A017428 A195274 * A088188 A017560 A128493

Adjacent sequences: A189146 A189147 A189148 * A189150 A189151 A189152

Keyword

nonn

Author

R. H. Hardin Apr 17 2011

Status

approved