Number of n X n binary arrays symmetric under 90-degree rotation with all ones connected only in a zee 1,1 1,2 2,2 2,3 in any orientation.
A145958
Number of n X n binary arrays symmetric under 90-degree rotation with all ones connected only in a zee 1,1 1,2 2,2 2,3 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =9a(6) =19a(7) =37a(8) =135a(9) =441a(10) =1879a(11) =9853a(12) =53945a(13) =336895a(14) =2463469a(15) =20551403a(16) =200816385a(17) =2276422523a(18) =29317863291a(19) =437152357559
External references
- oeis: A145958