Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 101-111-101 pattern in any orientation.
A146432
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 101-111-101 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =7a(7) =13a(8) =27a(9) =99a(10) =409a(11) =1589a(12) =6601a(13) =37581a(14) =257850a(15) =1891375a(16) =15191004a(17) =148990011a(18) =1749816180a(19) =23213477355a(20) =345838116504
External references
- oeis: A146432