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 A350397 #29 Feb 16 2025 08:34:02 %S A350397 305,1980,1900,3321,5256,8310,12516,17108,24832,34249,42381,61697, %T A350397 78766,106956,132994,170325,203415,266595,322943,393828,475520,569416, %U A350397 695799,823447,958300,1149125,1313545,1565055,1802736,2088119,2376250,2748270,3135195,3548876 %N A350397 a(n) is the smallest number which can be represented as the sum of n distinct nonzero n-gonal pyramidal numbers in exactly n ways, or -1 if no such number exists. %H A350397 Martin Ehrenstein, <a href="/A350397/b350397.txt">Table of n, a(n) for n = 3..52</a> %H A350397 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PyramidalNumber.html">Pyramidal Number</a> %e A350397 For n = 3: 305 = 1 + 84 + 220 = 20 + 120 + 165 = 56 + 84 + 165. %Y A350397 Cf. A080851, A350210, A350405. %K A350397 nonn %O A350397 3,1 %A A350397 _Ilya Gutkovskiy_, Dec 29 2021 %E A350397 a(10)-a(22) from _Michael S. Branicky_, Dec 29 2021 %E A350397 a(23)-a(36) from _Martin Ehrenstein_, Jan 14 2022