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 A118387 #7 May 25 2020 06:41:50 %S A118387 1,2,5,15,33,40,132,220,352,1258,2661,3903,9787,12989,17961,31373, %T A118387 33076,55262,110624 %N A118387 Record values in A079300 (number of shortest addition chains of n). %C A118387 Computed by _Neill M. Clift_. Verified up to a(17) by _David W. Wilson_. %D A118387 See A118386 for references. %F A118387 a(n) = A079300(A118386(n)). %Y A118387 Cf. A003313, A079300, A118386. %K A118387 nonn,hard,more %O A118387 1,2 %A A118387 _David W. Wilson_, Apr 26 2006