57267domain: NAppears in sequencesE.g.f.: (1/(1-x^3))*exp( 3*sum_{i>=0} x^(3*i+1)/(3*i+1) ) for an order-3 linear recurrence with varying coefficients.at n=7A097677Numbers that are the sum of fourth powers of three distinct positive integers in arithmetic progression.at n=40A306214