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 A332370 #11 Feb 13 2020 00:59:33 %S A332370 3,9,35,77,191,321,591,941,1503,2097,3047,4173,5835,7577,9815,12341, %T A332370 15763,19361,24083,29317,35615,42041,50095,58853,69395,80129,92675, %U A332370 106133,122239,138969,158751,179845,203651,227777,255023,283805,316931,350441,387599 %N A332370 Main diagonal of A332369. %Y A332370 Cf. A332369. %K A332370 nonn %O A332370 2,1 %A A332370 _N. J. A. Sloane_, Feb 12 2020