Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0100-1111 pattern in any orientation.
A146656
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0100-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =15a(8) =35a(9) =63a(10) =141a(11) =389a(12) =1325a(13) =3883a(14) =15377a(15) =77717a(16) =402273a(17) =2247249a(18) =12314001a(19) =75093365a(20) =525963699
External references
- oeis: A146656