G.f.: A(x) = Sum_{n>=0} x^n/[Sum_{k=0..n} C(n,k)^2*(-x)^k].
A178324
G.f.: A(x) = Sum_{n>=0} x^n/[Sum_{k=0..n} C(n,k)^2*(-x)^k].
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =26a(5) =146a(6) =1024a(7) =8776a(8) =89670a(9) =1071174a(10) =14749528a(11) =231333872a(12) =4090080388a(13) =80808196548
External references
- oeis: A178324