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 A014172 #8 Jul 08 2025 02:54:09 %S A014172 1,3,7,14,27,51,95,179,340,649,1243,2407,4691,9175,17982,35287,69588, %T A014172 137596,272448,539868,1070224,2122129,4217132,8389833,16700934, %U A014172 33255128,66228664,131908316 %N A014172 Apply partial sum operator twice to Stern's sequence. %H A014172 <a href="/index/St#Stern">Index entries for sequences related to Stern's sequences</a> %Y A014172 Cf. A005230. %K A014172 nonn %O A014172 0,2 %A A014172 _N. J. A. Sloane_