Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0010-1010-1111 pattern in any orientation.
A146781
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0010-1010-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =17a(8) =37a(9) =69a(10) =119a(11) =413a(12) =1361a(13) =4953a(14) =21841a(15) =100255a(16) =486625a(17) =2729263a(18) =14571959a(19) =98507721a(20) =677047259
External references
- oeis: A146781