Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.
A146011
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =1a(8) =4a(9) =1a(10) =9a(11) =3a(12) =31a(13) =9a(14) =123a(15) =22a(16) =539a(17) =75a(18) =3348a(19) =380a(20) =26210a(21) =2417a(22) =248376a(23) =17011a(24) =2847301a(25) =150387a(26) =41349456a(27) =1725197a(28) =766696111a(29) =24767029
External references
- oeis: A146011