161422

Appears in sequences

• Number of planar subpartitions of size n pyramidal planar partition.at n=5A115965
• Number 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, -1), (1, -1, 0), (1, 0, 1), (1, 1, 1)}.at n=9A150717
• Number 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, 1, -1), (1, 0, -1), (1, 1, 0), (1, 1, 1)}.at n=9A150718
• Let v = list of denominators of Farey series of order n (see A006843); a(n) = sum of products of adjacent terms of v.at n=32A278046