a(n) = ((n+1)^2*(n-1)*a(n-1)+(-1)^(n+1))/n.
A074702
a(n) = ((n+1)^2*(n-1)*a(n-1)+(-1)^(n+1))/n.
Terms
- a(0) =1a(1) =4a(2) =43a(3) =806a(4) =23213a(5) =947864a(6) =51997111a(7) =3685295242a(8) =327581799289
External references
- oeis: A074702
A074702
a(n) = ((n+1)^2*(n-1)*a(n-1)+(-1)^(n+1))/n.