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 A083926 #6 Jan 30 2024 08:23:26 %S A083926 0,0,1,0,2,3,0,0,0,4,5,6,7,8,0,0,0,0,0,0,0,0,0,9,10,11,12,13,14,15,16, %T A083926 17,18,19,20,21,22,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, %U A083926 0,0,0,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44 %N A083926 Inverse function of N -> N injection A072795. %C A083926 a(1)=0 because A072795(0)=1, but a(n) = 0 also for those n which do not occur as values of A072795. All positive natural numbers occur here once. %F A083926 a(n) = A083924(n)*A072772(n). %Y A083926 a(A072795(n)) = n for all n. Cf. A083925, A083927-A083929, A083935. %K A083926 nonn %O A083926 0,5 %A A083926 _Antti Karttunen_, May 13 2003