G.f.: exp( Sum_{n>=1} A206158(n)*x^n/n ), where A206158(n) = Sum_{k=0..n} binomial(n,k)^(2*k+1).
A206157
G.f.: exp( Sum_{n>=1} A206158(n)*x^n/n ), where A206158(n) = Sum_{k=0..n} binomial(n,k)^(2*k+1).
Terms
- a(0) =1a(1) =2a(2) =7a(3) =102a(4) =6261a(5) =2423430a(6) =6686021554
External references
- oeis: A206157