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 A051586 #6 Nov 04 2019 09:34:10 %S A051586 6,12,126,60,240,210,1080,336,1260,924,2016,2640,5280,11424,420,2520, %T A051586 840,5544,3696,14280,3360,25200,1680,6720,10920,26880,15960,137280, %U A051586 23100,43680,64680,21840,32760,24024,13860,7560,68040,49140,262080,60480,73920,133056,207900 %N A051586 There are exactly n integer-sided triangles of area a(n). %C A051586 If integer-sided triangle has integer area, area is divisible by 6. %H A051586 Giovanni Resta, <a href="/A051586/b051586.txt">Table of n, a(n) for n = 1..75</a> %Y A051586 Cf. A051584, A051585. %K A051586 nonn %O A051586 1,1 %A A051586 _David W. Wilson_ %E A051586 More terms from _Giovanni Resta_, Nov 04 2019