a(n) = (a(n-1) * a(n-3) - 2 * a(n-2)^2) / a(n-4) with a(0) = a(1) = a(2) = a(3) = 1.
A328380
a(n) = (a(n-1) * a(n-3) - 2 * a(n-2)^2) / a(n-4) with a(0) = a(1) = a(2) = a(3) = 1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =-1a(5) =-3a(6) =-5a(7) =-13a(8) =11a(9) =131a(10) =389a(11) =2311a(12) =9a(13) =-81511a(14) =-484247a(15) =-5751815a(16) =-17124617a(17) =710017141a(18) =9644648819a(19) =204006839259
External references
- oeis: A328380