G.f. satisfies: A(x) = 1 + Sum_{n>=1} n * (x*A(x))^(n*(n+1)/2) / (1 - x^n*A(x)^n).
A204218
G.f. satisfies: A(x) = 1 + Sum_{n>=1} n * (x*A(x))^(n*(n+1)/2) / (1 - x^n*A(x)^n).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =22a(5) =74a(6) =271a(7) =1012a(8) =3858a(9) =15046a(10) =59579a(11) =238825a(12) =967873a(13) =3958517a(14) =16316594a(15) =67716000a(16) =282719162a(17) =1186633647a(18) =5004102122a(19) =21192022233a(20) =90089538788a(21) =384305738731
External references
- oeis: A204218