a(n) = Sum_{k=0..n-1} ( 1 + a(k) * a(n-k-1) ) for n >= 1, a(0) = 1.

A305118

a(n) = Sum_{k=0..n-1} ( 1 + a(k) * a(n-k-1) ) for n >= 1, a(0) = 1.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =19a(4) =66a(5) =249a(6) =996a(7) =4148a(8) =17784a(9) =77939a(10) =347516a(11) =1571304a(12) =7187288a(13) =33196887a(14) =154611392a(15) =725284721a(16) =3423760262a(17) =16251813715a(18) =77523741208a(19) =371428985796

External references