Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-1100 pattern in any orientation.
A146681
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-1100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =9a(6) =21a(7) =93a(8) =334a(9) =1347a(10) =5976a(11) =45869a(12) =290540a(13) =3087921a(14) =28902351a(15) =440901387a(16) =5686714599
External references
- oeis: A146681