15701273

Appears in sequences

• Number of n X n binary matrices containing no 2 X 2 all-1s sub-block.at n=5A139810
• Number of n X n binary matrices, symmetric under horizontal and vertical reflection, with no more than 3 ones in any 2 X 2 subblock.at n=9A141510
• Number of nX5 binary matrices with no 2X2 block having four 1's.at n=4A181248
• T(n,k)=Number of nXk binary matrices with no 2X2 block having four 1's.at n=40A181253