Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1101-0111-0010 pattern in any orientation.

A147244

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1101-0111-0010 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) =3a(11) =3a(12) =9a(13) =9a(14) =27a(15) =27a(16) =87a(17) =87a(18) =355a(19) =355a(20) =2031a(21) =2031a(22) =15277

External references