Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only either three adjacent vertically or three adjacent horizontally.
A145759
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only either three adjacent vertically or three adjacent horizontally.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =1a(4) =10a(5) =1a(6) =76a(7) =9a(8) =925a(9) =45a(10) =17770a(11) =476a(12) =511138a(13) =6933a(14) =26358558a(15) =199238a(16) =2219828172a(17) =8764691a(18) =309763488262a(19) =657200985a(21) =80295518797
External references
- oeis: A145759