230406

Appears in sequences

• a(n) is the number of convex pentagons in an n-triangular net.at n=22A176646
• T(n,k)=Number of nXk 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 1 or 4 neighboring 1s.at n=47A297682
• Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 1 or 4 neighboring 1s.at n=7A297683