Number of simple connected graphs on n unlabeled nodes.

A001349

Number of simple connected graphs on n unlabeled nodes.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =6a(5) =21a(6) =112a(7) =853a(8) =11117a(9) =261080a(10) =11716571a(11) =1006700565a(12) =164059830476

External references