244698domain: NAppears in sequencesExpansion of 1/(1-x-x^2-x^3-x^4+x^5+x^6+x^7).at n=21A257934Number of permutations s_1,s_2,...,s_n of 1,2,...,n such that for all j=1,2,...,n, j divides Sum_{i=1..j} s_i^3.at n=52A291355