Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1110-0111-0100 pattern in any orientation.

A146735

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1110-0111-0100 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =1a(11) =1a(12) =7a(13) =7a(14) =21a(15) =21a(16) =51a(17) =51a(18) =221a(19) =221a(20) =1241a(21) =1241a(22) =9517

External references