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 A329634 #5 Nov 18 2019 16:45:27 %S A329634 1,5,6,15,20,21,35,50,55,56,69,104,119,121,124,125,190,195,225,240, %T A329634 245,246,295,316,385,420,425,435,440,441,490,589,611,680,715,720,730, %U A329634 735,736,791,915,1014,1035,1036,1105,1140,1155,1160,1161,1309,1325,1380,1504,1625,1665,1694 %N A329634 Numbers that are sums of consecutive centered tetrahedral numbers (A005894). %Y A329634 Cf. A005894, A132366, A322468, A322610, A329635, A329636. %K A329634 nonn %O A329634 1,2 %A A329634 _Ilya Gutkovskiy_, Nov 18 2019