Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 101-111-101 pattern in any orientation.
A146434
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 101-111-101 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =3a(9) =1a(10) =5a(11) =1a(12) =9a(13) =3a(14) =20a(15) =7a(16) =76a(17) =13a(18) =246a(19) =27a(20) =866a(21) =99a(22) =3607a(23) =409a(24) =20611a(25) =1589a(26) =124905a(27) =6601a(28) =826121a(29) =37581
External references
- oeis: A146434