G.f.: A(x) = Sum_{n>=0} x^n * A(x)^(n*(n+1)/2) * (1 - A(x)^(n+1))/(1 - A(x)).
A199543
G.f.: A(x) = Sum_{n>=0} x^n * A(x)^(n*(n+1)/2) * (1 - A(x)^(n+1))/(1 - A(x)).
Terms
- a(0) =1a(1) =2a(2) =9a(3) =59a(4) =462a(5) =4011a(6) =37253a(7) =362877a(8) =3662590a(9) =38001809a(10) =403118473a(11) =4354812135a(12) =47769686769a(13) =530912871966
External references
- oeis: A199543