136331domain: NAppears in sequencesNumerator of Sum_{k=1..n} phi(k)/k^3.at n=4A072158Triangular array T(n,k) read by rows: column k is the expansion of e.g.f: exp(-2*x)*(exp(x)-1)^k/(2-exp(x)).at n=37A372245G.f.: Sum_{k>=0} x^(k*(k+1)/2) * Product_{j=1..k} 1/(1 - x^j)^3.at n=27A376707