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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, 5574656798624151746571203, 490966794038702258639391536, 43240039834820302340627322251
OFFSET
0,2
LINKS
Per Hakan Lundow, Computation of matching polynomials and the number of 1-factors in polygraphs, Research report, No 12, 1996, Department of Math., Umea University, Sweden.
Sergey Perepechko, Generating function, May 07 2013
CROSSREFS
Column 7 of triangle A210662.
Sequence in context: A215160 A250062 A219000 * A123844 A172622 A172675
KEYWORD
nonn
AUTHOR
EXTENSIONS
Terms a(13) and beyond from Andrew Howroyd, Apr 18 2021
STATUS
approved