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 A353971 #4 May 18 2022 10:05:17 %S A353971 1,2,6,13,17,24,120,720,5040,40320,362880,3628800,39916800 %N A353971 Numbers that are not the sum of distinct terms of A353969. %C A353971 Also positions of 0's in A353970. %C A353971 This sequence is infinite as it contains the factorial numbers (A000142). %H A353971 Rémy Sigrist, <a href="/A353971/a353971.txt">C++ program</a> %o A353971 (C++) See Links section. %Y A353971 Cf. A000142, A353969, A353970. %K A353971 nonn,more %O A353971 1,2 %A A353971 _Rémy Sigrist_, May 14 2022