499178domain: NAppears in sequencesa(n) = Sum_{k=0..6} binomial(n,k).at n=28A008859Numbers of vectors with 2*n integers such that each element is either 1 or -1, and their sum > n.at n=13A226197a(n) = Sum_{k=0..n} binomial(4*n+4,k).at n=6A387011