Consider the family of multigraphs enriched by the species of involutions. Sequence gives number of those multigraphs with n loops and edges.
A099697
Consider the family of multigraphs enriched by the species of involutions. Sequence gives number of those multigraphs with n loops and edges.
Terms
- a(0) =1a(1) =2a(2) =11a(3) =93a(4) =1135a(5) =18567a(6) =387976a(7) =9991794a(8) =308837454a(9) =11225560583a(10) =472141867849
External references
- oeis: A099697