Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0110-1111-0110 pattern in any orientation.

A146919

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0110-1111-0110 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =4a(8) =8a(9) =13a(10) =37a(11) =82a(12) =203a(13) =410a(14) =1390a(15) =3260a(16) =13938a(17) =41809a(18) =202082a(19) =670860a(20) =3891211

External references