Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation.

A146829

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =5a(8) =29a(9) =45a(10) =85a(11) =149a(12) =631a(13) =1787a(14) =7789a(15) =27255a(16) =169603a(17) =656441a(18) =4413871a(19) =19468207a(20) =157401839

External references