Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-0010 pattern in any orientation.
A146632
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-0010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =15a(8) =45a(9) =69a(10) =191a(11) =523a(12) =2197a(13) =7857a(14) =44519a(15) =172481a(16) =1142709a(17) =5725361a(18) =46827941a(19) =294096301a(20) =2934334465a(21) =22633368087
External references
- oeis: A146632