Number of set-like molecular species of degree n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =7a(5) =9a(6) =20a(7) =26a(8) =54a(9) =74a(10) =137a(11) =184a(12) =356a(13) =473a(14) =841a(15) =1154a(16) =2034a(17) =2742a(18) =4740a(19) =6405a(20) =10874a(21) =14794a(22) =24515a(23) =33246a(24) =54955a(25) =74380a(26) =120501a(27) =163828a(28) =263144a(29) =356621