Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1111-1111 pattern in any orientation.
A146938
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1111-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =1a(9) =4a(10) =1a(11) =6a(12) =3a(13) =13a(14) =7a(15) =38a(16) =14a(17) =126a(18) =39a(19) =447a(20) =110a(21) =1805a(22) =377a(23) =8300a(24) =1728a(25) =44775a(26) =8445a(27) =290627a(28) =46261a(29) =2170182
External references
- oeis: A146938