3096514domain: NAppears in sequencesa(n) = 2^n - C(n,0)- ... - C(n,9).at n=22A035042a(n) = Sum_{k=0..12} binomial(n,k).at n=22A219615a(n) = Sum_{i=0..n+1} binomial(2*n,n-i+1).at n=11A277924