a(n) = A001850(n^2), where A001850 forms the central Delannoy numbers.

A228192

a(n) = A001850(n^2), where A001850 forms the central Delannoy numbers.

Terms

    a(0) =1a(1) =3a(2) =321a(3) =1462563a(4) =252055236609

External references