102230domain: NAppears in sequencesa(n) = n*a(n-1) - 1 with a(1)=1.at n=8A056543Expansion of 1/(1 - x - x^2 + x^4 - x^6).at n=29A117791Expansion of 1/(1 - Sum_{j>=1} x^(Sum_{i=1..j} prime(i))).at n=52A282906