

A033510


Number of matchings in graph P_{7} X P_{n}.


3



1, 21, 2356, 196785, 17525619, 1539222016, 135658637925, 11945257052321, 1052091957273408, 92657526436631289, 8160498611028648795, 718704019165239462736, 63297158846544276862187
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OFFSET

0,2


LINKS

Table of n, a(n) for n=0..12.
Per Hakan Lundow, Computation of matching polynomials and the number of 1factors in polygraphs, Research report, No 12, 1996, Department of Math., Umea University, Sweden.
Per Hakan Lundow, Enumeration of matchings in polygraphs, 1998.
Sergey Perepechko, Generating function, May 07 2013
Sergey Perepechko, Text version of generating function


CROSSREFS

Column 7 of triangle A210662.
Sequence in context: A215160 A250062 A219000 * A123844 A172622 A172675
Adjacent sequences: A033507 A033508 A033509 * A033511 A033512 A033513


KEYWORD

nonn


AUTHOR

Per H. Lundow


STATUS

approved



