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 A036669 #13 May 29 2023 02:26:37 %S A036669 0,0,0,0,0,1,1,3,7,18,42,109,269,691,1759,4542,11733,30559,79743, %T A036669 209136,549959,1451178,3838925,10182703,27069940,72121696,192527888, %U A036669 514908269,1379454526,3701556642,9947456861,26770280299,72138803942 %N A036669 Duplicate of A000633. %Y A036669 Cf. A000599, A000600. %K A036669 nonn,dead %O A036669 0,8 %A A036669 _N. J. A. Sloane_