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 A225933 #6 May 22 2013 20:33:11 %S A225933 180,1269,5940,20454,140470,304548,605685,1965462,5261278,17967252, %T A225933 25736406,49799782,155060070,254724622,402876885,616803846,918048406, %U A225933 1109465220,2638932670,4871761782,6475385158,11018543046,14135549422,22598655270,42920128086 %N A225933 Number of conjugacy classes in adjoint Chevalley group E_6(q) as q runs through the prime powers. %H A225933 Eric M. Schmidt, <a href="/A225933/b225933.txt">Table of n, a(n) for n = 1..1000</a> %H A225933 Frank Luebeck, <a href="http://www.math.rwth-aachen.de/~Frank.Luebeck/chev/nrclasses/nrclasses.html">Numbers of Conjugacy Classes in Finite Groups of Lie Type</a>. %F A225933 Let q be the n-th prime power. %F A225933 a(n) = q^6 + q^5 + 2q^4 + 2q^3 + 9q^2 + 9q + 22 if q == 1 (mod 6). %F A225933 a(n) = q^6 + q^5 + 2q^4 + 2q^3 + 6q^2 + 4q + 4 if q == 2 (mod 6). %F A225933 a(n) = q^6 + q^5 + 2q^4 + 2q^3 + 7q^2 + 5q + 3 if q == 3 (mod 6). %F A225933 a(n) = q^6 + q^5 + 2q^4 + 2q^3 + 8q^2 + 8q + 20 if q == 4 (mod 6). %F A225933 a(n) = q^6 + q^5 + 2q^4 + 2q^3 + 7q^2 + 5q + 4 if q == 5 (mod 6). %o A225933 (Sage) def A225933(q) : return q^6 + q^5 + 2*q^4 + 2*q^3 + [9*q^2 + 9*q + 22, 6*q^2 + 4*q + 4, 7*q^2 + 5*q + 3, 8*q^2 + 8*q + 20, 7*q^2 + 5*q + 4][q%6-1] %Y A225933 Cf. A188161, A224790, A225928 - A225938. %K A225933 nonn %O A225933 1,1 %A A225933 _Eric M. Schmidt_, May 21 2013