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 A090246 #14 Aug 12 2018 16:13:46 %S A090246 2,4,10,20,56 %N A090246 The largest subset of P(Z/3Z)^n that does not contain 3 collinear points. %C A090246 P(Z/3Z)^n is the projective space of n dimensions over the finite field Z/3Z. This is the size of the largest subset which does not contain 3 points lying in a line. %C A090246 Davis and Maclagan described a game similar to the game SET that could be played in this space using projective lines, rather than in (Z/3Z)^n using the algebraic notion of line. This sequence is the analog of A090245 for this game. %C A090246 So far this sequence agrees with A104442. %H A090246 B. Davis and D. Maclagan, <a href="http://math.stanford.edu/~maclagan/papers/set.pdf">The Card Game SET</a>, The Mathematical Intelligencer, Vol. 25:3 (Summer 2003), pp. 33-40. %H A090246 B. L. Davis and D. Maclagan, <a href="http://galileo.stmarys-ca.edu/bdavis/set.pdf">The Card Game SET</a> [From _Omar E. Pol_, Feb 21 2009] %H A090246 Ivars Peterson, <a href="http://www.sciencenews.org/20030823/mathtrek.asp">SET Math</a>. %H A090246 Ivars Peterson, <a href="http://www.maa.org/mathland/mathtrek_08_25_03.html"> SET Math</a> [From _Omar E. Pol_, Feb 21 2009] %Y A090246 Cf. A090245. %K A090246 nonn,more %O A090246 1,1 %A A090246 _Hans Havermann_, Jan 23 2004 %E A090246 Edited by _Jack W Grahl_, May 12 2009