OFFSET
1,2
COMMENTS
Perfect matchings exist only for graphs with an even number of nodes.
LINKS
Eric Weisstein's World of Mathematics, Perfect Matching
FORMULA
a(n) = A286951(2*n, n). - Andrew Howroyd, Sep 05 2019
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Mar 26 2013
STATUS
approved