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 A028690 #18 Nov 07 2018 18:05:45 %S A028690 1,2,6,12,20,24,30,42,56,72,90,110,132,156,182,210,240,272,306,342, %T A028690 380,420,432,462,506,552,600,650,702,756,812,870,930,992,1056,1122, %U A028690 1190,1260,1332,1344,1406,1482,1560,1640,1722,1806,1892,1980,2070,2162,2256,2352 %N A028690 Sorted Galois and Pseudo-Galois numbers. %H A028690 Alois P. Heinz, <a href="/A028690/b028690.txt">Table of n, a(n) for n = 1..10000</a> %Y A028690 Cf. A028665, A028667, A028668, ..., A028689, A028691. %K A028690 nonn %O A028690 1,2 %A A028690 _Olivier Gérard_ %E A028690 Offset changed to 1 by _Alois P. Heinz_, Nov 07 2018