Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.
A146904
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =7a(8) =13a(9) =27a(10) =81a(11) =287a(12) =1153a(13) =4961a(14) =23911a(15) =134777a(16) =885445a(17) =6659249a(18) =57412261a(19) =568445509a(20) =6410206283a(21) =82425528579
External references
- oeis: A146904