Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1101-0111 pattern in any orientation.
A147057
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1101-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =15a(8) =43a(9) =67a(10) =135a(11) =405a(12) =1643a(13) =5861a(14) =31427a(15) =120095a(16) =674029a(17) =3441725a(18) =24151139a(19) =153308175a(20) =1325530085
External references
- oeis: A147057