147960domain: NAppears in sequencesCoefficients in quasimodular form F_2(q) of level 1 and weight 6.at n=30A126858Expansion of 1/((1-x)*(1-2*x^2)*(1-3*x^3)*(1-4*x^4)).at n=23A291987Number of permutations f of {1,...,n} such that prime(k) + prime(f(k)) + 1 is prime for every k = 1,...,n.at n=13A321727