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 A297498 #6 Jan 01 2018 11:02:09 %S A297498 0,1,3,7,16,38,90,205,448,958,2053,4469,9865,21849,48061,104528, %T A297498 225121,482604,1035645,2232465,4834839,10493118,22741212,49074143, %U A297498 105310104,224848260,478534828,1017589272,2166420555,4622251945,9880423145,21130501775,45125126211 %N A297498 Right edge of triangle A297497. %H A297498 Lars Blomberg, <a href="/A297498/b297498.txt">Table of n, a(n) for n = 0..1000</a> %Y A297498 Cf. A297497. %K A297498 nonn %O A297498 0,3 %A A297498 _N. J. A. Sloane_, Dec 31 2017 %E A297498 Terms a(7) and beyond from _Lars Blomberg_, Jan 01 2018