51874

Appears in sequences

• Triangulations of an n-gon such that each internal vertex has valence at least 6, i.e., nonpositively curved triangulations.at n=12A060049
• Number of (n+1) X 3 binary arrays with rows and columns in nondecreasing order and with no 2 X 2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one.at n=34A184064