1232795

Appears in sequences

• Number of n X n binary matrices containing no more than two 1's in any 2 X 2 subblock.at n=5A140314
• Number of n X n binary matrices, symmetric under horizontal and vertical reflection, with no more than 2 ones in any 2 X 2 subblock.at n=9A141504
• Number of (n+1)X5 binary arrays with no 2X2 subblock containing fewer than two 1s.at n=3A184202
• T(n,k)=Number of (n+1)X(k+1) binary arrays with no 2X2 subblock containing fewer than two 1s.at n=24A184207