279275domain: NAppears in sequencesExponent of least power of 2 having exactly n consecutive 7's in its decimal representation.at n=10A131541Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (0, -1, 1), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.at n=11A148487