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 A360217 #8 Feb 16 2025 08:34:04 %S A360217 1,140,305,315,435,644,830,1141,1425,1925,2380,3010,3805,4720,5806, %T A360217 7095,8510,10200,12020,14115,16460,19131,21990,25425,29275,33495, %U A360217 37425,42680,48300,54545,60711,68391,75726,84815,93370,103250,114115,125360,137831,150995,165545,179830 %N A360217 a(n) is the smallest positive integer which can be represented as the sum of n distinct nonzero tetrahedral numbers in exactly n ways, or -1 if no such integer exists. %H A360217 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TetrahedralNumber.html">Tetrahedral Number</a> %e A360217 For n = 3: 305 = 1 + 84 + 220 = 20 + 120 + 165 = 56 + 84 + 165. %Y A360217 Cf. A000292, A350205, A350288, A350397, A360218. %K A360217 nonn %O A360217 1,2 %A A360217 _Ilya Gutkovskiy_, Jan 30 2023 %E A360217 More terms from _David A. Corneth_, Jan 30 2023