Number of n X n binary matrices, symmetric under 90-degree rotation, with no more than 3 ones in any 2 X 2 subblock.

A141513

Number of n X n binary matrices, symmetric under 90-degree rotation, with no more than 3 ones in any 2 X 2 subblock.

Terms

    a(0) =1a(1) =2a(2) =1a(3) =7a(4) =8a(5) =101a(6) =207a(7) =5120a(8) =20417a(9) =961969a(10) =7321136a(11) =661511545a(12) =9650955373

External references