a(n) = Sum_{k=0..n} (-n)^k * binomial(2*n,2*k).
A333991
a(n) = Sum_{k=0..n} (-n)^k * binomial(2*n,2*k).
Terms
- a(0) =1a(1) =0a(2) =-7a(3) =64a(4) =-527a(5) =3776a(6) =-7199a(7) =-712704a(8) =28545857a(9) =-881543168a(10) =25615822601a(11) =-733594255360
External references
- oeis: A333991