Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a one by five or five by one block.
A145966
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a one by five or five by one block.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =9a(5) =1a(6) =16a(7) =1a(8) =49a(9) =1a(10) =384a(11) =25a(12) =3677a(13) =173a(14) =58365a(15) =1794a(16) =1326578a(17) =20685a(18) =34318014a(19) =319727a(20) =1264197446a(21) =6676539a(22) =64169954075a(23) =232552310
External references
- oeis: A145966