-37748736domain: ZAppears in sequencesa(0)=1. a(n) = 2^(n-2)*(5-n), for n>0.at n=23A172160Coefficients in the expansion of 1/([r] + [2r]x + [3r]x^2 + ...); [ ] = floor, r = 3/2.at n=25A279634