Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-1111 pattern in any orientation.

A146743

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-1111 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =13a(7) =29a(8) =57a(9) =123a(10) =437a(11) =1523a(12) =7643a(13) =32273a(14) =153925a(15) =786845a(16) =5340469a(17) =36899655a(18) =318800081a(19) =2591600741a(20) =26626203639a(21) =272703572385

External references