Number of asymmetric types of (3,n)-hypergraphs without isolated nodes, under action of symmetric group S_3; asymmetric n-covers of an unlabeled 3-set.
A055538
Number of asymmetric types of (3,n)-hypergraphs without isolated nodes, under action of symmetric group S_3; asymmetric n-covers of an unlabeled 3-set.
Terms
- a(0) =4a(1) =20a(2) =65a(3) =170a(4) =383a(5) =779a(6) =1470a(7) =2611a(8) =4418a(9) =7182a(10) =11283a(11) =17213a(12) =25601a(13) =37230a(14) =53074a(15) =74327a(16) =102434a(17) =139133a(18) =186501a(19) =246988a(20) =323479a(21) =419344a(22) =538492a(23) =685438a(24) =865376a(25) =1084236a(26) =1348777a(27) =1666664a(28) =2046551a(29) =2498179
External references
- oeis: A055538