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..200
Per Hakan Lundow, Enumeration of matchings in polygraphs, 1998.
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved