Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-1000 pattern in any orientation.
A146419
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-1000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =9a(8) =24a(9) =33a(10) =92a(11) =207a(12) =751a(13) =1987a(14) =9135a(15) =27247a(16) =151575a(17) =553091a(18) =3687021a(19) =16183258a(20) =127736835a(21) =672115551a(22) =6393532548a(23) =40630854716a(24) =467493592708
External references
- oeis: A146419