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 A062684 #10 Sep 19 2020 03:42:08 %S A062684 1,2,3,5,7,10,13,18,23,29,37,46,55,68,81,96,115,135,155,183,211,241, %T A062684 277,317,357,407,457,513,577,645,713,799,885,977,1079,1191,1305,1438, %U A062684 1571,1717,1875,2048,2221,2423,2625,2840,3077,3333,3589,3876,4163 %N A062684 Number of addition triangles with apex n (version 1). %C A062684 An addition triangle has any set of positive numbers as base; other rows are formed by adding pairs of adjacent numbers. %C A062684 Reversing the base counts as a different triangle. %H A062684 Seiichi Manyama, <a href="/A062684/b062684.txt">Table of n, a(n) for n = 1..200</a> %e A062684 For n = 5: %e A062684 5 5 %e A062684 2,3 3,2 5 5 5 5 %e A062684 1,1,2 2,1,1 4,1 1,4 2,3 3,2 5 %e A062684 with seven different bases, so a(5) = 7. %Y A062684 Cf. A028307, A066411, see A062896 for version 2. %K A062684 easy,nonn %O A062684 1,2 %A A062684 _Naohiro Nomoto_, Feb 11 2002 %E A062684 Extended and edited by _John W. Layman_, Feb 14 2002