Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1101-0111 pattern in any orientation.
A146727
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1101-0111 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) =35a(15) =35a(16) =157a(17) =157a(18) =741a(19) =741a(20) =4435a(21) =4435a(22) =44453a(23) =44453
External references
- oeis: A146727