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 A119255 #15 Sep 23 2018 22:34:08 %S A119255 1,1,2,6,19,63,219,787,2897,10869,41414,159822,623391,2453727,9733866, %T A119255 38877318,156206233,630947421,2560537092,10435207116,42689715279, %U A119255 175243923783,721649457417,2980276087005,12340456995177,51222441676513 %N A119255 Duplicate of A071969. %K A119255 dead %O A119255 0,3