A033512 Number of matchings in graph P_{9} X P_{n}.

1, 55, 24342, 7594361, 2548684656, 842518533590, 279533139565077, 92657526436631289, 30721240815429999078, 10185111919160666118608, 3376771882017849561260401, 1119528305492897225312120742, 371166848426649070379972358241, 123056076089539426001744759117065

Offset

0,2

References

Per Hakan Lundow, "Computation of matching polynomials and the number of 1-factors in polygraphs", Research reports, No 12, 1996, Department of Mathematics, Umea University.

Links

Alois P. Heinz, Table of n, a(n) for n = 0..400

Per Hakan Lundow, Enumeration of matchings in polygraphs, 1998.

Crossrefs

Column k=9 of A210662.

Sequence in context: A231826 A163036 A358785 * A201008 A172722 A221000

Adjacent sequences: A033509 A033510 A033511 * A033513 A033514 A033515

Keyword

nonn

Author

Per H. Lundow

Status

approved