118966domain: NAppears in sequencesNumber of pairs of intersecting diagonals in the interior and exterior of a regular n-gon.at n=31A211380Expansion of e.g.f. Product_{k>0} (1 + sin(x)^k / k!).at n=10A335644Expansion of Sum_{k>0} x^(4*k)/(1-x^k)^5.at n=41A363608