This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A054645 #5 May 10 2013 12:44:27 %S A054645 0,0,2,6,10,10,6,2,0,0,0,1,10,63,207,525,954,1395,1550,1395,954,525, %T A054645 207,63,10,1,0,0,1,28,258,1503,6475,21810,59540,134333,254178,407040, %U A054645 555356,648054,648054,555356,407040,254178,134333,59540,21810,6475 %N A054645 Triangle T(n,k) of asymmetric n X n binary matrices with k=0..n^2 ones under action of dihedral group of the square D_4. %C A054645 Row sums give A054385. %e A054645 The batch [0,0,2,6,10,10,6,2,0,0] gives the numbers of asymmetric 3 X 3 binary matrices with k=0..9 ones under action of dihedral group of the square D_4. %e A054645 There are 6 nonequivalent asymmetric 3 X 3 binary matrices with 3 ones under action of D_4: %e A054645 [0 0 0] [0 0 0] [0 0 0] [0 0 0] [0 0 0] [0 0 1] %e A054645 [0 0 1] [0 0 1] [0 1 0] [0 1 1] [1 0 1] [0 0 0] %e A054645 [1 0 1] [1 1 0] [0 1 1] [1 0 0] [0 0 1] [1 1 0]. %Y A054645 Cf. A054252. %K A054645 nonn,tabf,nice %O A054645 3,3 %A A054645 _Vladeta Jovovic_, May 15 2000