Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation.
A147340
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-0100-1111-0010-0010 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) =9a(11) =9a(12) =25a(13) =25a(14) =57a(15) =57a(16) =341a(17) =341a(18) =3079a(19) =3079a(20) =34841a(21) =34841a(22) =488119a(23) =488119a(24) =8511553
External references
- oeis: A147340