a(0)=1; for n > 0, a(n)=sum(binomial(n,k)*(binomial(n+k,k+1)^2)* binomial(n+k,k),k=0..n).
A075514
a(0)=1; for n > 0, a(n)=sum(binomial(n,k)*(binomial(n+k,k+1)^2)* binomial(n+k,k),k=0..n).
Terms
- a(0) =1a(1) =3a(2) =154a(3) =7941a(4) =429036a(5) =24123105a(6) =1399303662a(7) =83176893681
External references
- oeis: A075514