G.f. A(x) satisfies A(x) = Sum_{n>=0} x^n * (1+x)^(n*(3*n+1)/2) / A(x)^(n*(n+1)/2).
A380679
G.f. A(x) satisfies A(x) = Sum_{n>=0} x^n * (1+x)^(n*(3*n+1)/2) / A(x)^(n*(n+1)/2).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =7a(5) =15a(6) =48a(7) =177a(8) =792a(9) =3985a(10) =21616a(11) =125845a(12) =773128a(13) =4995356a(14) =33768501a(15) =237936780a(16) =1742684309a(17) =13233752561a(18) =103985325332a(19) =843956110146
External references
- oeis: A380679