63624domain: NAppears in sequencesSum of the prime factors of k equals half the sum of the prime factors of k + 1.at n=23A074213Structured snub cubic numbers.at n=21A100150Species of Latin trades of size n.at n=15A133167Coefficient of x^n in Product_{k>=1} ((1+x^k)/(1-x^k))^(2*n).at n=5A304447