OFFSET
0,2
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
KEYWORD
nonn
AUTHOR
EXTENSIONS
Terms a(13) and beyond from Andrew Howroyd, Apr 18 2021
STATUS
approved