283464domain: NAppears in sequencesa(n) = T(2n-1,n-1), T given by A026648.at n=9A026652a(n) = T(n,[ n/2 ]), T given by A026648.at n=19A026654The number of edges on a nonagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.at n=4A332429