a(n) = Sum_{k=0..n} (-1)^(n-k) * k^(2*n).

A349889

a(n) = Sum_{k=0..n} (-1)^(n-k) * k^(2*n).

Terms

    a(0) =1a(1) =1a(2) =15a(3) =666a(4) =59230a(5) =8775075a(6) =1948891581a(7) =605698755508

External references