G.f.: A(x) = exp( Sum_{n>=1} A005260(n)*x^n/(2*n) ), where A005260(n) = Sum_{k=0..n} C(n,k)^4.
A166993
G.f.: A(x) = exp( Sum_{n>=1} A005260(n)*x^n/(2*n) ), where A005260(n) = Sum_{k=0..n} C(n,k)^4.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =32a(4) =266a(5) =2499a(6) =25765a(7) =283084a(8) =3264502a(9) =39077898a(10) =481942608a(11) =6089941550a(12) =78523226064
External references
- oeis: A166993