Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-1000 pattern in any orientation.
A146416
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-1000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =9a(7) =21a(8) =62a(9) =243a(10) =1174a(11) =7129a(12) =48787a(13) =396149a(14) =3872121a(15) =46149825a(16) =666105009a(17) =11588188375a(18) =240646188473
External references
- oeis: A146416