109466domain: NAppears in sequencesExpansion of Product_{k>=1} 1/(1-x^k)^(k*(k-1)*(k-2)/6).at n=19A258352a(1) = 13; for n > 1, if a(n-1) is even, then a(n) = a(n-1)/2; otherwise, a(n) = a(n-1) + prime(a(n-1)).at n=22A358166