-38791923555domain: ZAppears in sequencesa(n+1) = a(n) - n (if n is even), a(n+1) = a(n) * n (if n is odd).at n=21A047907a(n+1) = (a(n) - 2*(n-1)) * (2*n-1), where a(1)=1.at n=11A339516