G.f. satisfies A(x) = Sum_{n>=0} x^n * (1+x)^(2*n^2) / A(x)^(n*(n+1)).
A380687
G.f. satisfies A(x) = Sum_{n>=0} x^n * (1+x)^(2*n^2) / A(x)^(n*(n+1)).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =16a(7) =50a(8) =270a(9) =1266a(10) =7017a(11) =40073a(12) =243665a(13) =1556727a(14) =10394483a(15) =72403198a(16) =524195255a(17) =3936080686a(18) =30591479055a(19) =245655102572
External references
- oeis: A380687