G.f. satisfies: A(x) = Sum_{n>=0} x^n * Sum_{k=0..n} x^k * {[x^k] A(x)^(3*n)}.
A249936
G.f. satisfies: A(x) = Sum_{n>=0} x^n * Sum_{k=0..n} x^k * {[x^k] A(x)^(3*n)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =7a(4) =49a(5) =85a(6) =565a(7) =1016a(8) =7350a(9) =13195a(10) =95564a(11) =173088a(12) =1275166a(13) =2317299a(14) =17166633a(15) =31318180a(16) =233446920a(17) =427044441a(18) =3195627268a(19) =5859732238a(20) =43994595982a(21) =80828819606a(22) =608411734754
External references
- oeis: A249936