3315312000domain: NAppears in sequencesa(n) = (n-1)!*binomial(3*n,n)/(3*(2*n+1)).at n=7A076151Number of words (over an alphabet of size 26) of length n with all different letters.at n=7A106793Products of 7 consecutive integers.at n=26A159083a(n) = Product_{k=0..n-1} (3*n+k-1).at n=7A384263