273158645760domain: NAppears in sequencesNumber of simplices in barycentric subdivision of n-simplex.at n=9A005462a(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=13A228912