Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-11111-00100 pattern in any orientation.
A147006
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-11111-00100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =7a(8) =14a(9) =39a(10) =108a(11) =339a(12) =1512a(13) =7447a(14) =40037a(15) =248431a(16) =1729177a(17) =13906995a(18) =133020215a(19) =1477709272a(20) =18786585661a(21) =273016606323
External references
- oeis: A147006