Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-1000 pattern in any orientation.
A147126
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-1000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =9a(7) =23a(8) =55a(9) =223a(10) =1115a(11) =7199a(12) =49215a(13) =368043a(14) =3428835a(15) =40706551a(16) =594200493a(17) =10158791409a(18) =204811760131
External references
- oeis: A147126