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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
OFFSET
0,2
LINKS
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 A361311 A007816
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Feb 21 2021
STATUS
approved