78402domain: NAppears in sequencesa(n) = floor(n*(n-1)*(n-2)*(n-3)/31).at n=41A011941Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (-1, 1), (0, -1), (1, 0), (1, 1)}.at n=10A151438a(n) = 108*n^2 - 228*n + 114 (n>=2).at n=26A304618