42390domain: NAppears in sequencesa(n) = 2*(n-1)*(n^2 + 1).at n=27A071233Number of one-element transitions among all integer partitions of the integers from m=0 to m=n in the unlabeled case.at n=20A096586Expansion of g.f.: f'(t)/f(t), where f(t) = Sum_{p prime} t^p.at n=23A307977