A287053 Number of perfect matchings in the graph P_2 X P_9 X P_n.

1, 55, 87362, 54003765, 43402320448, 32567565264292, 24976513162427653, 19056798015394695543, 14569902220123180849570, 11135886394033736561250816, 8513244230416326065909810345, 6508281831123403112229534915956, 4975689584055269435866523080540937

Offset

0,2

Links

Alois P. Heinz, Table of n, a(n) for n = 0..120

Eric Weisstein's World of Mathematics, Perfect Matching

Wikipedia, Matching (graph theory)

Crossrefs

Column k=9 of A181206.

Sequence in context: A231907 A027580 A265980 * A046194 A172808 A243315

Adjacent sequences: A287050 A287051 A287052 * A287054 A287055 A287056

Keyword

nonn

Author

Alois P. Heinz, May 18 2017

Status

approved