Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1110-0111 pattern in any orientation.
A146821
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1110-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =17a(8) =41a(9) =79a(10) =223a(11) =801a(12) =2615a(13) =9741a(14) =48585a(15) =263431a(16) =1569087a(17) =9472069a(18) =65995437a(19) =509339343a(20) =4406836165
External references
- oeis: A146821