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A341503 Number of matchings in the 4 X n rook graph. 1
1, 10, 193, 5950, 270529, 16873930, 1384880065, 144218696590, 18583827550465, 2898418007316970, 538034003700151105, 117117180185558050750, 29538673951318735414465, 8540274169019607609510250, 2805241403079208727201012545, 1038436904586470317663800172750 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..50

EXAMPLE

The a(1) = 10 matchings consist of the empty matching, 6 matchings with a single edge and 3 perfect matchings.

CROSSREFS

Row 4 of A270227.

Sequence in context: A134633 A006436 A252974 * A187652 A007816 A126463

Adjacent sequences:  A341500 A341501 A341502 * A341504 A341505 A341506

KEYWORD

nonn

AUTHOR

Andrew Howroyd, Feb 21 2021

STATUS

approved

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Last modified October 7 10:36 EDT 2022. Contains 357270 sequences. (Running on oeis4.)