a(n) = A002426(n^2), where A002426 is the central trinomial coefficients.
A225602
a(n) = A002426(n^2), where A002426 is the central trinomial coefficients.
Terms
- a(0) =1a(1) =1a(2) =19a(3) =3139a(4) =5196627a(5) =82176836301
External references
- oeis: A225602