Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1100-0111 pattern in any orientation.
A146394
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1100-0111 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) =9a(13) =9a(14) =23a(15) =23a(16) =77a(17) =77a(18) =415a(19) =415a(20) =2809a(21) =2809a(22) =21039a(23) =21039
External references
- oeis: A146394