Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.
A147379
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =7a(8) =15a(9) =33a(10) =101a(11) =381a(12) =1709a(13) =8457a(14) =46629a(15) =303839a(16) =2310935a(17) =20572541a(18) =212895819a(19) =2545278493a(20) =35199007061
External references
- oeis: A147379