Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-001 pattern in any orientation.
A146238
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =13a(7) =41a(8) =61a(9) =189a(10) =645a(11) =2565a(12) =9811a(13) =68255a(14) =363653a(15) =2795931a(16) =15874613a(17) =158718393a(18) =1217432647a(19) =15841966869a(20) =160951013553
External references
- oeis: A146238