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A209539 Number of nX4 array permutations with every element making zero or one right-handed knight moves (out 2, right 1) 1
1, 4, 72, 729, 6480, 63504, 635040, 6350400, 63504000, 635040000, 6350400000, 63504000000, 635040000000, 6350400000000, 63504000000000, 635040000000000, 6350400000000000, 63504000000000000, 635040000000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A209543

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 10*a(n-1) for n>6

EXAMPLE

Some solutions for n=4

..6..7..9..3....0..8..2..3....6..7..2.10....0..7..9..3....6..1..2..3

.10..5..0..1...10.12.13.14....4.12..0..1....4..5..6..1....4.11..0.14

.14..2..4.11....1..9..4.11...14.15..3.11....8..2.10.11....8..9.10..5

.12.13..8.15....5..6..7.15....5.13..8..9...12.13.14.15...12.13..7.15

CROSSREFS

Sequence in context: A062018 A192830 A119580 * A139745 A066992 A165212

Adjacent sequences:  A209536 A209537 A209538 * A209540 A209541 A209542

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 10 2012

STATUS

approved

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Last modified March 29 18:39 EDT 2017. Contains 284273 sequences.