68643domain: NAppears in sequencesNumber of intersection points of all lines through pairs of vertices of a regular n-gon.at n=26A146212Numbers m such that abs(K(m+1) - K(m)) = 1, where K(m) = A002034(m) is the Kempner function.at n=35A346211a(n) = (2*n+1)*(n^3-2*n^2+n+1).at n=14A347319