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 A350423 #16 Feb 16 2025 08:34:02 %S A350423 190,289,330,561 %N A350423 a(n) is the smallest n-gonal number which can be represented as the sum of n distinct nonzero n-gonal numbers in exactly n ways, or -1 if none exists. %H A350423 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PolygonalNumber.html">Polygonal Number</a> %e A350423 For n = 3: 190 = 1 + 36 + 153 = 15 + 55 + 120 = 21 + 78 + 91. %Y A350423 Cf. A057145, A350405. %K A350423 nonn,more %O A350423 3,1 %A A350423 _Ilya Gutkovskiy_, Dec 31 2021