Number of n X n binary matrices, symmetric under horizontal reflection, with no more than 1 one in any 2 X 2 subblock.
A141482
Number of n X n binary matrices, symmetric under horizontal reflection, with no more than 1 one in any 2 X 2 subblock.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =11a(4) =8a(5) =269a(6) =85a(7) =16334a(8) =5933a(9) =4005785a(10) =817280a(11) =2758179839a(12) =505375405a(14) =826573277157
External references
- oeis: A141482