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 A119954 #13 Jul 28 2025 10:54:10 %S A119954 3,2,-2,9,24,33,21,-2,-6,18,47,30,-13,-20,4,-7,-32,-42,-59,-80,-77, %T A119954 -66,-74,-107,-128,-98,-67,-81,-127,-151,-142,-119,-107,-117,-151, %U A119954 -190,-176,-136,-123,-158,-193,-202,-173,-140,-133,-165,-204,-188,-140,-113,-151,-205,-195,-127,-82,-88,-120 %N A119954 Y = X = 'i + .25(ii + jj + kk + e); Z = 'i - i' + .5(jj + kk - jk + kj) + e. See pdf-file and comment for an exact definition (this sequence gives an initial term 3); Version "les". %C A119954 To obtain this sequence, follow the same instructions given for A119953. A119953(n) was obtained by adding the coefficients of 'i and i' at the end of the n-th iteration. a(n) is obtained by adding the coefficients of the basis vectors ij, ik, ji, jk, ki, kj at the end of the n-th iteration. Note: Some of these coefficients are always 0. "Version les" refers to the 6 basis vectors mentioned above. %H A119954 Creighton Dement, <a href="/A119954/b119954.txt">Table of n, a(n) for n = 0..30000</a> %H A119954 Creighton Dement, <a href="/A119953/a119953.pdf">Construction of an integer sequence with musical properties</a>. %Y A119954 Cf. A119953, A108618. %K A119954 sign %O A119954 0,1 %A A119954 _Creighton Dement_, Jun 09 2006