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 A223540 #19 Apr 04 2013 14:25:55 %S A223540 1,2,3,4,8,6,8,12,11,13,16,32,64,128,24,32,48,128,192,44,52,64,128,96, %T A223540 176,75,141,103,128,192,176,208,141,198,185,222,256,512,1024,2048, %U A223540 4096,8192,16384,32768,384,512,768,2048,3072,8192,12288 %N A223540 Matrix T(m,n) = nim-product(2^m,2^n) read by rows of lower triangle. %C A223540 More compact representation of the symmetric matrix A223541. %C A223540 This sequence is related to A223541, as A046899 is to A007318. %H A223540 Tilman Piesk, <a href="/A223540/b223540.txt">First 128 rows of the matrix, flattened</a> %H A223540 Tilman Piesk, <a href="http://en.wikiversity.org/wiki/Walsh_permutation;_nimber_multiplication">Walsh permutation; nimber multiplication</a> (Wikiversity) %Y A223540 Cf. A223541. %K A223540 nonn,tabl %O A223540 0,2 %A A223540 _Tilman Piesk_, Mar 21 2013