322681

Appears in sequences

• Number of (n+2) X 3 0..2 matrices with each 3 X 3 subblock idempotent.at n=17A224599
• a(n) is the number of paths in the Z X Z grid joining (0,0) and (n,n) each of whose steps increases the Euclidean distance to the origin and has coordinates with absolute value at most 1.at n=6A346539