Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 2X2 elbow 1,1 1,2 2,1 in any orientation.
A145938
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 2X2 elbow 1,1 1,2 2,1 in any orientation.
Terms
- a(0) =1a(1) =3a(2) =7a(3) =23a(4) =131a(5) =971a(6) =9431a(7) =139347a(8) =2886057a(9) =82544813a(10) =3341873733a(11) =191910369845
External references
- oeis: A145938