Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11011-01110 pattern in any orientation.

A147229

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11011-01110 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =4a(7) =9a(8) =18a(9) =29a(10) =62a(11) =159a(12) =552a(13) =1625a(14) =6033a(15) =18370a(16) =76478a(17) =293679a(18) =1560810a(19) =7445670a(20) =46344151a(21) =251751509a(22) =1816985360a(23) =11749000262

External references