298629domain: NAppears in sequencesPisot sequence T(5,9), a(n) = floor(a(n-1)^2/a(n-2)).at n=20A020750Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 1), (1, -1), (1, 1)}.at n=13A151267