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 A280538 #12 Jan 06 2017 08:41:44 %S A280538 1,1,232,38,36 %N A280538 Number of essentially different optimal solutions for the n X n X n "No four in plane" problem. %C A280538 a(7) >= 3885, with an estimated value of about 5500. %H A280538 Ed Pegg, <a href="http://math.stackexchange.com/questions/553431/no-four-in-plane-can-11-points-be-picked-from-a-4-times4-times4-grid">No-Four-In-Plane, can 11 points be picked from a 4 X 4 X 4 grid?</a>. Question in Mathematics Stack Exchange, Configurations corresponding to a(4) and a(5) provided in answers. %H A280538 Walter Möhres and Hugo Pfoertner, <a href="/A280538/a280538.txt">36 optimal solutions for the 6 X 6 X 6 "No four in plane" problem.</a> %e A280538 a(2)=1, because there exists only one normalized configuration (removing rotations and reflections) with A280537(2)=5 points: (0,0,0),(0,0,1),(0,1,0),(1,0,0),(1,1,1). %e A280538 a(3)=1, because there exists only one normalized configuration with A280537(3)=8 points: (0,0,0),(0,1,1),(0,1,2),(1,0,1),(1,1,0),(1,2,0),(2,0,1),(2,2,2). %Y A280538 Cf. A280537 for links and references. %K A280538 nonn,hard,more %O A280538 2,3 %A A280538 _Hugo Pfoertner_, Jan 05 2017