1776775domain: NAppears in sequencesTriangle T(n,k), n >= 0, 0 <= k <= n, read by rows, where T(n,k) = 3^(n-k) * T(n-1,k-1) + 4^k * T(n-1,k) with T(n,k) = n^k if n*k=0.at n=24A383755Expansion of 1/Product_{k=0..3} (1 - 3^k * 4^(3-k) * x).at n=3A383757