Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11110-01111 pattern in any orientation.

A147511

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11110-01111 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =9a(8) =15a(9) =29a(10) =57a(11) =137a(12) =413a(13) =1389a(14) =4485a(15) =15371a(16) =54209a(17) =224739a(18) =1032991a(19) =5497929a(20) =29140255a(21) =171761393a(22) =1058704295a(23) =7315438183

External references