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 A363253 #8 Feb 16 2025 08:34:05 %S A363253 28,121,210 %N A363253 a(n) is the smallest n-gonal number which can be represented as the sum of distinct nonzero n-gonal numbers in exactly n ways, or -1 if no such number exists. %C A363253 a(8) = 736, a(9) = 969. %H A363253 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PolygonalNumber.html">Polygonal Number</a> %e A363253 For n = 3: 1 + 6 + 21 = 3 + 10 + 15 = 28. %Y A363253 Cf. A057145, A350207, A350405, A350423. %K A363253 nonn,bref,more,hard %O A363253 3,1 %A A363253 _Ilya Gutkovskiy_, May 23 2023