Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111-1001 pattern in any orientation.

A146927

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111-1001 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =7a(9) =10a(10) =30a(11) =37a(12) =151a(13) =202a(14) =698a(15) =975a(16) =4066a(17) =6719a(18) =38176a(19) =61756a(20) =522856a(21) =808712a(22) =8751773a(23) =13746429a(24) =162280787a(25) =268587501a(26) =3757757825a(27) =6472225006a(28) =115990561431a(29) =202655793135

External references