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 A278060 #18 May 30 2024 03:04:59 %S A278060 1,2,3,4,5,6,7,8,3,9,10,5,11,6,7,12,14,10,8,14,18,12,15,8,23,13,10,17, %T A278060 13,25,16,19,20,13,19,29,18,17,30,24,24,20,23,26,20,27,24,26,38,13,28, %U A278060 38,30,20,42,35,19,45,30,32,29,45,23,32,40 %N A278060 Relative of Hofstadter Q-sequence: a(n) = n for 1 <= n <= 8; a(n) = a(n-a(n-1)) + a(n-a(n-2)) for n > 8. %C A278060 Similar to Hofstadter's Q-sequence A005185 but with different starting values. %C A278060 This sequence has exactly 420 terms, since a(420)=430 and computing a(421) would refer to a(-9). %H A278060 Nathan Fox, <a href="/A278060/b278060.txt">Table of n, a(n) for n = 1..420</a> %H A278060 Nathan Fox, <a href="https://vimeo.com/191094180">Hofstadter-like Sequences over Nonstandard Integers</a>, Talk given at the Rutgers Experimental Mathematics Seminar, November 10 2016. %t A278060 a[n_] := a[n] = If[0 < n < 9, n, a[n-a[n-1]] + a[n-a[n-2]]]; %t A278060 Array[a, 100] (* _Paolo Xausa_, May 29 2024 *) %Y A278060 Cf. A005185, A278056, A278057, A278058, A278059, A278061, A278062, A278063, A278064, A278065. %K A278060 nonn,fini,full %O A278060 1,2 %A A278060 _Nathan Fox_, Nov 10 2016