Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0111-1100 pattern in any orientation.

A146676

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0111-1100 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =18a(9) =9a(10) =118a(11) =25a(12) =954a(13) =93a(14) =7545a(15) =633a(16) =121807a(17) =8913a(18) =3109792a(19) =136370a(20) =104854969a(21) =2447483a(22) =4391577608a(23) =66801664a(24) =267821817268a(25) =2869431585

External references