173077domain: NAppears in sequencesa(n) = Sum_{k=0..n} (k+1) * A026747(n, k).at n=13A027227Number of positive integers <= 10^n that are divisible by no prime exceeding 13.at n=13A106629Expansion of 1/(1-x-x^2+x^3-x^4).at n=30A124280