296598domain: NAppears in sequencesNumbers k such that 2*k^k - 1 is prime.at n=5A110931Number 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), (1, 0, -1), (1, 1, 1)}.at n=11A149260