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 A117869 #12 Aug 30 2025 10:09:06 %S A117869 1,3,10,30,84,232,635,1731,4711,12814,34840,94714,257468,699881, %T A117869 1902485,5171502,14057612,38212564,103872533,282354833,767520028, %U A117869 2086335762,5671248608,15416052054,41905174183,113910073520,309639682948 %N A117869 Partial sums of A000149. %t A117869 Accumulate[Floor[E^Range[0,4000]]] (* _Harvey P. Dale_, Jul 18 2011 *) %Y A117869 Cf. A000149. %K A117869 easy,nonn,less,changed %O A117869 0,2 %A A117869 _Jonathan Vos Post_, May 02 2006