676396domain: NAppears in sequences[ 3rd elementary symmetric function of {sqrt(k+1)} ], k = 1,2,...,n.at n=35A025220Number of 4Xn 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 1 0 0 vertically.at n=8A207662