Consider the family of multigraphs enriched by the species of involutions. Sequence gives number of those multigraphs with n labeled edges.
A099696
Consider the family of multigraphs enriched by the species of involutions. Sequence gives number of those multigraphs with n labeled edges.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =25a(4) =244a(5) =3380a(6) =62133a(7) =1440382a(8) =40673705a(9) =1364815169a(10) =53415511305
External references
- oeis: A099696