Expansion of g.f. A(x) = Sum_{n>=0} d^n/dx^n x^(2*n) * (1 + x)^(3*n) / n!.
A361303
Expansion of g.f. A(x) = Sum_{n>=0} d^n/dx^n x^(2*n) * (1 + x)^(3*n) / n!.
Terms
- a(0) =1a(1) =2a(2) =15a(3) =92a(4) =615a(5) =4200a(6) =29190a(7) =205416a(8) =1458909a(9) =10436030a(10) =75079719a(11) =542669244a(12) =3937604853a(13) =28664996080a(14) =209261546580
External references
- oeis: A361303