Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111-0001 pattern in any orientation.
A146849
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =17a(9) =17a(10) =53a(11) =53a(12) =349a(13) =349a(14) =3775a(15) =3775a(16) =72823a(17) =72823a(18) =2211763a(19) =2211763a(20) =82363675a(21) =82363675
External references
- oeis: A146849