Number of connected unlabeled symmetric relations (graphs with loops) having n nodes.

A054921

Number of connected unlabeled symmetric relations (graphs with loops) having n nodes.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =10a(4) =50a(5) =354a(6) =3883a(7) =67994a(8) =2038236a(9) =109141344a(10) =10693855251

External references