Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1001-1111 pattern in any orientation.

A147134

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1001-1111 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =13a(7) =31a(8) =81a(9) =343a(10) =1923a(11) =13549a(12) =94903a(13) =802247a(14) =8564607a(15) =113354205a(16) =1800337015a(17) =33663851515a(18) =758043047263

External references