278785domain: NAppears in sequencesa(0) = 1; a(n) = 4^(n+1)*a(n-1)+1.at n=3A130449Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (0, 1, -1), (0, 1, 1), (1, 0, 1), (1, 1, -1)}.at n=9A150758Central coefficients of number triangle A113582.at n=32A154323