Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-101 pattern in any orientation.
A146258
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-101 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =9a(7) =9a(8) =33a(9) =33a(10) =81a(11) =81a(12) =609a(13) =609a(14) =23953a(15) =23953a(16) =643873a(17) =643873a(18) =12050113a(19) =12050113a(20) =545308145a(21) =545308145
External references
- oeis: A146258