Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 101-111-010 pattern in any orientation.

A146218

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 101-111-010 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =10a(7) =5a(8) =44a(9) =17a(10) =490a(11) =45a(12) =4847a(13) =317a(14) =94850a(15) =5736a(16) =2753328a(17) =99087a(18) =124970926a(19) =2137142a(20) =7708832169a(21) =81606063a(22) =748069343112a(23) =5341611544a(25) =471313494449

External references