Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-101 pattern in any orientation.
A146261
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-101 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =3a(11) =3a(12) =13a(13) =13a(14) =31a(15) =31a(16) =77a(17) =77a(18) =447a(19) =447a(20) =3609a(21) =3609a(22) =25623
External references
- oeis: A146261