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 A244507 #14 Aug 17 2014 15:29:54 %S A244507 1,3,14,78,468,2907,18392,117645,757965,4908540 %N A244507 Square roots of A244506. %C A244507 A244506 gives the number of ways to place the maximal number of points that can be placed on a j X j X j triangular grid, j = 3n-2, so that no pair of them has distance sqrt(3). These numbers are all square numbers. A244507 gives the roots of them. %Y A244507 Cf. A244506, A244500. %K A244507 nonn,hard,more %O A244507 1,2 %A A244507 _Heinrich Ludwig_, Jul 11 2014 %E A244507 a(10) from _Heinrich Ludwig_, Aug 17 2014