a(n) = A000172(n^2), where Franel number A000172(n) = Sum_{k=0..n} C(n,k)^3.

A216356

a(n) = A000172(n^2), where Franel number A000172(n) = Sum_{k=0..n} C(n,k)^3.

Terms

    a(0) =1a(1) =2a(2) =346a(3) =5280932

External references