Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-110 pattern in any orientation.
A146266
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-110 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =10a(7) =5a(8) =44a(9) =17a(10) =490a(11) =45a(12) =3832a(13) =281a(14) =72349a(15) =4672a(16) =1945156a(17) =78267a(18) =77811492a(19) =1571678a(20) =4162726786a(21) =52679419a(22) =355835905036a(23) =3071977536a(25) =240721783237
External references
- oeis: A146266