a(n) = (4/(2*n-3))*(2*(n-1)*(2*n-1)*a(n-1) + (-1)^n*Product_{k=0..n-1} (2*k+1)) with a(0) = 0.
A302113
a(n) = (4/(2*n-3))*(2*(n-1)*(2*n-1)*a(n-1) + (-1)^n*Product_{k=0..n-1} (2*k+1)) with a(0) = 0.
Terms
- a(0) =0a(1) =4a(2) =108a(3) =2860a(4) =96180a(5) =3956580a(6) =193437420a(7) =10973128140a(8) =709033518900
External references
- oeis: A302113