OFFSET
0,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..100
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.
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved