1695222domain: NAppears in sequencesa(n) = 2^n - C(n,0) - C(n,1) - ... - C(n,8).at n=21A035041a(n) = Sum_{k=0..12} binomial(n,k).at n=21A219615a(n) = number of subsets of {1,2,...,n} that contain more nonprimes than primes.at n=21A369853Expansion of 1/(g * (2-g))^2, where g = 1+x*g^2 is the g.f. of A000108.at n=12A391222