Number of n X n binary arrays symmetric under 90-degree rotation with all ones connected only either two adjacent vertically or two adjacent horizontally.

A145779

Number of n X n binary arrays symmetric under 90-degree rotation with all ones connected only either two adjacent vertically or two adjacent horizontally.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =4a(4) =8a(5) =17a(6) =58a(7) =224a(8) =939a(9) =4970a(10) =30996a(11) =225413a(12) =1970184a(13) =20575972a(14) =252185309a(15) =3690646219a(16) =64088665934

External references