180128

Appears in sequences

• Number 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), (0, 1), (1, -1)}.at n=16A151381
• Number of binary strings of length n with equal numbers of 00101 and 01011 substrings.at n=18A164246