-6564120420domain: ZAppears in sequencesO.g.f. inverse of Catalan A000108 o.g.f.at n=21A115140Convolution of A115140 with itself.at n=21A115141Expansion of (-1 + 2*x + sqrt( 1 - 4*x^2)) / (2*x) in powers of x.at n=41A210628Convolution inverse of A001700.at n=21A246432