Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.
A146149
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =3a(8) =7a(9) =7a(10) =17a(11) =17a(12) =57a(13) =57a(14) =295a(15) =295a(16) =1823a(17) =1823a(18) =12191a(19) =12191a(20) =109351a(21) =109351a(22) =1406131a(23) =1406131a(24) =21111023a(25) =21111023a(26) =390067193a(27) =390067193a(28) =9744306045a(29) =9744306045
External references
- oeis: A146149