14270256000domain: NAppears in sequencesNumber of simplices in barycentric subdivision of n-simplex.at n=9A005461Number of n X n binary matrices with no 0 rows or columns and with n+1 1's.at n=10A055602a(n) = 10^n - 9*9^n + 36*8^n - 84*7^n + 126*6^n - 126*5^n + 84*4^n - 36*3^n + 9*2^n - 1.at n=12A228912