Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-00100-00100-11111 pattern in any orientation.
A147321
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-00100-00100-11111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =7a(8) =16a(9) =39a(10) =109a(11) =339a(12) =1359a(13) =6341a(14) =32204a(15) =186717a(16) =1250465a(17) =9543435a(18) =82560858a(19) =815884422a(20) =9279731421a(21) =121699162939
External references
- oeis: A147321