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A181395 Summed lengths of nonintersecting rook paths on a 4 x n board 5
3, 40, 284, 1912, 13132, 88608, 577727, 3659416, 22719964, 139088248, 842307548, 5055782456, 30119691570 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Paths are self-avoiding from one corner to the diagonally opposite corner.

LINKS

Table of n, a(n) for n=1..13.

CROSSREFS

Enumeration of these paths is A007786, related sequences A181394, A181396, A181397, A181398, A181399.

Sequence in context: A013291 A013292 A278379 * A165395 A165386 A293501

Adjacent sequences:  A181392 A181393 A181394 * A181396 A181397 A181398

KEYWORD

nonn

AUTHOR

David Scambler, Oct 17 2010

EXTENSIONS

a(10)-a(13) from Alois P. Heinz, Dec 10 2011

STATUS

approved

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Last modified December 12 15:11 EST 2019. Contains 329960 sequences. (Running on oeis4.)