Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0001 pattern in any orientation.

A146605

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0001 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =9a(7) =19a(8) =59a(9) =237a(10) =1193a(11) =6925a(12) =46535a(13) =385115a(14) =3834729a(15) =46129325a(16) =665267927a(17) =11525172145a(18) =240724568637

External references