a(n) = (n mod 2) if n <= 3, otherwise a(n) = (n^2-5n+7)*(n-2)*a(n-1)/(n-3) + (n^2-5n+7)*a(n-2) - (n-2)*a(n-3)/(n-3).
A144656
a(n) = (n mod 2) if n <= 3, otherwise a(n) = (n^2-5n+7)*(n-2)*a(n-1)/(n-3) + (n^2-5n+7)*a(n-2) - (n-2)*a(n-3)/(n-3).
Terms
- a(0) =0a(1) =1a(2) =0a(3) =1a(4) =4a(5) =49a(6) =900a(7) =24649a(8) =944784a(9) =48455521a(10) =3210355600a(11) =267186643801
External references
- oeis: A144656