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 A107357 #26 Jan 14 2023 03:10:51 %S A107357 2,3,2,1,3,4,1,8,9,5,64,2,317,79,17,2049,7653,26628,9,24001,232920, %T A107357 1145407,3498690007594650042369,2058538,59,27,28,60,9272781,4, %U A107357 69273669,4870848,2387010102192469724605148123694256129,2,2,-52,44,1,-4695,174,44584,111111111111111111111111111111111111111112,30402458,668803782,1134903171,382443020333 %N A107357 a(n) = 1 + A_n(n), or a(n) = -1 if sequence A_n is not defined up to index n. %C A107357 What is a(107357)? %C A107357 See A051070, A091967, A102288 for more about this type of sequence. %H A107357 N. J. A. Sloane, <a href="https://arxiv.org/abs/2301.03149">"A Handbook of Integer Sequences" Fifty Years Later</a>, arXiv:2301.03149 [math.NT], 2023, p. 21. %H A107357 <a href="/index/Se#selfies">Index entries for sequences whose definition involves A_n (or An)</a>. %Y A107357 a(n) = A051070(n) + 1 (except when A_n has fewer than n terms). See also A091967 and A102288 (the same but ignoring the offset). %K A107357 sign %O A107357 1,1 %A A107357 _N. J. A. Sloane_, May 25 2005 %E A107357 Definition revised by _N. J. A. Sloane_, Nov 27 2016 %E A107357 Definition rephrased by _M. F. Hasler_, Jan 20 2017 %E A107357 Corrected a(36) and a(42), extended to a(46) by _M. F. Hasler_, Jan 21 2017