Consider the family of multigraphs enriched by the species of even sets. Sequence gives number of those multigraphs with 2n edges.

A098632

Consider the family of multigraphs enriched by the species of even sets. Sequence gives number of those multigraphs with 2n edges.

Terms

    a(0) =1a(1) =1a(2) =7a(3) =166a(4) =9367a(5) =991186a(6) =171380452a(7) =44509993711

External references