G.f.: A(x) = exp( Sum_{n>=1} A005260(n)*x^n/n ) where A005260(n) = Sum_{k=0..n} C(n,k)^4.
A166992
G.f.: A(x) = exp( Sum_{n>=1} A005260(n)*x^n/n ) where A005260(n) = Sum_{k=0..n} C(n,k)^4.
Terms
- a(0) =1a(1) =2a(2) =11a(3) =74a(4) =621a(5) =5850a(6) =60212a(7) =659712a(8) =7583514a(9) =90494068a(10) =1112755389a(11) =14022849582a(12) =180362150901
External references
- oeis: A166992