Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.
A147173
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =11a(7) =27a(8) =57a(9) =269a(10) =1741a(11) =11383a(12) =71261a(13) =614161a(14) =7140843a(15) =99666239a(16) =1560593149a(17) =29491532325a(18) =702793762267
External references
- oeis: A147173