Number of n X n binary matrices, symmetric under horizontal reflection, with no more than 3 ones in any 2 X 2 subblock.
A141509
Number of n X n binary matrices, symmetric under horizontal reflection, with no more than 3 ones in any 2 X 2 subblock.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =57a(4) =128a(5) =22077a(6) =65205a(7) =114142368a(8) =468343535
External references
- oeis: A141509