Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-100-111 pattern in any orientation.

A146177

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-100-111 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =13a(7) =33a(8) =61a(9) =115a(10) =431a(11) =1359a(12) =5125a(13) =23279a(14) =156491a(15) =866819a(16) =5189807a(17) =30665629a(18) =248556857a(19) =1970821419a(20) =20754531695a(21) =214278299237

External references