
LINKS

Table of n, a(n) for n=0..5.
Per Hakan Lundow, Computation of matching polynomials and the number of 1factors in polygraphs, Research reports, No 12, 1996, Department of Mathematics, Umea University.
Per Hakan Lundow, Enumeration of matchings in polygraphs, 1998.
Eric Weisstein's World of Mathematics, Grid Graph
Eric Weisstein's World of Mathematics, Independent Edge Set
Eric Weisstein's World of Mathematics, Matching
