Number of n X n binary arrays symmetric about the diagonal and under 90-degree rotation with all ones connected only in a 1 X 5 or 5 X 1 block.
A145969
Number of n X n binary arrays symmetric about the diagonal and under 90-degree rotation with all ones connected only in a 1 X 5 or 5 X 1 block.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =1a(8) =3a(9) =1a(10) =6a(11) =1a(12) =15a(13) =3a(14) =43a(15) =8a(16) =140a(17) =27a(18) =656a(19) =89a(20) =3196a(21) =333a(22) =18641a(23) =1310a(24) =125685a(25) =7293a(26) =1010276a(27) =48975a(28) =9527791a(29) =401989
External references
- oeis: A145969