69231domain: NAppears in sequencesa(n) = (2*n - 1)*(8*n^2 - 8*n + 3)/3.at n=23A063496Number of regions in regular n-gon which are quadrilaterals (4-gons) when all its diagonals are drawn.at n=43A067151Number of reduced words of length n in the Weyl group D_9.at n=12A162212