Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-100 pattern in any orientation.
A146186
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =17a(7) =39a(8) =67a(9) =157a(10) =683a(11) =2593a(12) =13101a(13) =70047a(14) =421791a(15) =2622253a(16) =19003451a(17) =153761107a(18) =1499143675a(19) =15781975001a(20) =199989123849
External references
- oeis: A146186