36404121600domain: NAppears in sequencesa(n) = Sum_{permutations p of [n]} des(p^2), where des(p) is the number of descents of p.at n=12A385366Expansion of e.g.f. (1/x) * Series_Reversion( x/(1 + log(1-x^2)^2/x) ).at n=12A392887