a(n) = 4*(n-1)*a(n-1) - (1/3)*Product_{k=0..n-1} (2*k-3), with a(0) = 0.
A302117
a(n) = 4*(n-1)*a(n-1) - (1/3)*Product_{k=0..n-1} (2*k-3), with a(0) = 0.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =23a(4) =273a(5) =4353a(6) =86955a(7) =2085975a(8) =58396905a(9) =1868565825a(10) =67266342675
External references
- oeis: A302117