a(n) = (1/6) * 2^(-n) * n! * [x^n] Exp(2*x, 1)*(Exp(2*x, 3) - 1), where Exp(x, m) = Sum_{k>=0} (x^k / k!)^m.
A344559
a(n) = (1/6) * 2^(-n) * n! * [x^n] Exp(2*x, 1)*(Exp(2*x, 3) - 1), where Exp(x, m) = Sum_{k>=0} (x^k / k!)^m.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =4a(5) =10a(6) =35a(7) =140a(8) =476a(9) =1624a(10) =6070a(11) =22495a(12) =81455a(13) =301301a(14) =1131494a(15) =4230681a(16) =15852396a(17) =59881956a(18) =226877648a(19) =860447129a(20) =3273728234a(21) =12493453344a(22) =47760610689a(23) =182905145214a(24) =701883651799
External references
- oeis: A344559