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 A240910 #21 Feb 16 2025 08:33:21 %S A240910 0,31,15,16,7,24,8,23,3,28,12,19,4,27,11,20,1,30,14,17,6,25,9,22,2,29, %T A240910 13,18,5,26,10,21 %N A240910 The sequency numbers of the 32 rows of a Hadamard-Walsh matrix, order 32. %C A240910 See A240908 for context. This sequence is the natural sequency ordering for an order 32 matrix. %H A240910 N. J. A. Sloane, <a href="http://neilsloane.com/hadamard">A Library of Hadamard Matrices</a> %H A240910 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HadamardMatrix.html">Hadamard Matrix</a> %H A240910 Wikipedia, <a href="http://en.wikipedia.org/wiki/Walsh_matrix">Walsh matrix</a> %F A240910 Recursion: H(2) = [1 1; 1 -1]; H(n) = H(n-1) * H(2), where * is the Kronecker matrix product. %e A240910 This is a fixed length sequence of only 32 values, as given in full above. %Y A240910 Cf. A240908 "natural order" sequencies for Hadamard-Walsh matrix, order 8. %Y A240910 Cf. A240909 "natural order" sequencies for Hadamard-Walsh matrix, order 16. %Y A240910 Cf. A153141 "dyadic order" sequencies for Hadamard-Walsh matrix, all orders. %Y A240910 Cf. A000975(n) is sequency of last row of H(n). - _William P. Orrick_, Jun 28 2015 %K A240910 nonn,fini,full %O A240910 1,2 %A A240910 _Ross Drewe_, Apr 14 2014 %E A240910 Definition of H(n) corrected by _William P. Orrick_, Jun 28 2015