Number of n X n binary arrays symmetric about main diagonal with all ones connected only either four adjacent vertically or four adjacent horizontally.

A145792

Number of n X n binary arrays symmetric about main diagonal with all ones connected only either four adjacent vertically or four adjacent horizontally.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =8a(6) =27a(7) =89a(8) =350a(9) =1943a(10) =13578a(11) =114816a(12) =1134812a(13) =13374912a(14) =197153652a(15) =3619365346a(16) =81478825413

External references