883369

Appears in sequences

• Expansion of x * (d/dx) Sum_{k>=0} k!*x^(k*(k+1)/2)/Product_{j=1..k} (1 - x^j).at n=29A304797
• E.g.f. satisfies A(x) = (1+x)^2 * exp( x * (1+x) * A(x) ).at n=6A378017