Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-111 pattern in any orientation.
A146277
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =3a(8) =5a(9) =5a(10) =9a(11) =9a(12) =21a(13) =21a(14) =93a(15) =93a(16) =381a(17) =381a(18) =1551a(19) =1551a(20) =7459a(21) =7459a(22) =56347a(23) =56347a(24) =473995a(25) =473995a(26) =4321181
External references
- oeis: A146277