A033510 Number of matchings in graph P_{7} X P_{n}.

1, 21, 2356, 196785, 17525619, 1539222016, 135658637925, 11945257052321, 1052091957273408, 92657526436631289, 8160498611028648795, 718704019165239462736, 63297158846544276862187, 5574656798624151746571203, 490966794038702258639391536, 43240039834820302340627322251

Offset: 0

Author

Per H. Lundow

Keywords

• nonn

Links

• Andrew Howroyd, Table of n, a(n) for n = 0..200
• 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.
• 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.

Extensions

Terms a(13) and beyond from Andrew Howroyd, Apr 18 2021