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 A279444 #9 Jan 04 2017 05:16:08 %S A279444 1,6,78,1428,34020,1005720,35526120,1460297160,68483325960, %T A279444 3608847088560,211125189789360,13577790144108960,952129825291925280, %U A279444 72303731169467878080,5911241852357814772800,517670861532464104264800,48347072773751574327304800 %N A279444 Number of ways to place n points on an n X n square grid so that no more than 2 points are on a vertical or horizontal straight line. %C A279444 Rotations and reflections of placements are counted. If they are to be ignored, see A279452. %H A279444 Hiroaki Yamanouchi, <a href="/A279444/b279444.txt">Table of n, a(n) for n = 1..100</a> %Y A279444 Cf. A279452, A279445. %K A279444 nonn %O A279444 1,2 %A A279444 _Heinrich Ludwig_, Dec 23 2016 %E A279444 a(11)-a(17) from _Hiroaki Yamanouchi_, Jan 04 2017