Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.
A147267
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =27a(9) =51a(10) =87a(11) =231a(12) =993a(13) =2999a(14) =11701a(15) =48597a(16) =296399a(17) =1545465a(18) =9380053a(19) =56658941a(20) =454413807
External references
- oeis: A147267