G.f.: A(x) = x/(1 - x - G001190(x^2)), where G001190 is the g.f. of A001190, the Wedderburn-Etherington numbers (binary rooted trees).
A093126
G.f.: A(x) = x/(1 - x - G001190(x^2)), where G001190 is the g.f. of A001190, the Wedderburn-Etherington numbers (binary rooted trees).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =10a(6) =19a(7) =33a(8) =62a(9) =110a(10) =204a(11) =366a(12) =675a(13) =1219a(14) =2239a(15) =4059a(16) =7439a(17) =13518a(18) =24737a(19) =45018a(20) =82304a(21) =149924a(22) =273929a(23) =499290a(24) =911902a(25) =1662787a(26) =3036105a(27) =5537577a(28) =10109364a(29) =18441799
External references
- oeis: A093126