Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation.
A146254
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =11a(8) =15a(9) =27a(10) =47a(11) =153a(12) =311a(13) =1151a(14) =2849a(15) =13187a(16) =36901a(17) =183137a(18) =600651a(19) =3599693a(20) =14056563a(21) =100844845a(22) =464890609a(23) =3938830471a(24) =21240835037a(25) =209440142193
External references
- oeis: A146254