20680192

Appears in sequences

• Number of routes of length 2n on the sides of an octagon from a point to opposite point.at n=14A060995
• Number of n step walks (each step +/-1 starting from 0) which are never more than 3 or less than -3.at n=27A068912
• Even entries (A048967) minus the odd entries (A001316) in row n of Pascal's triangle (A007318).at n=27A085814