487577domain: NAppears in sequencesNumber 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, 0), (-1, 0, 0), (0, 1, 0), (1, -1, 1), (1, 0, -1)}.at n=12A148392Number of (n+6)X12 0..1 matrices with each 7X7 subblock idempotent.at n=20A224586