210009domain: NAppears in sequencesNumbers k such that k*(k+7) is a palindrome.at n=15A028564Number 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), (-1, 0, 1), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.at n=12A148158