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 A210634 #27 Mar 27 2025 11:39:04
%S A210634 0,0,0,0,0,0,0,0,0,0,0,0,1,3,9,20,42,78,139,231,372,573,861,1254,1791,
%T A210634 2499,3432,4629,6162,8085,10492,13455,17094,21503,26832,33201,40795,
%U A210634 49764,60333,72687,87096,103785,123075,145236,170646,199626,232617,269997,312277,359898,413448,473438,540540,615342,698608
%N A210634 G.f. for Ehrhart quasi-polynomials for hyperplane arrangements of type E_6.
%H A210634 Harvey P. Dale, <a href="/A210634/b210634.txt">Table of n, a(n) for n = 0..1000</a>
%H A210634 Andreas Blass, Bruce E. Sagan, <a href="http://arxiv.org/abs/math/9801008">Characteristic and Ehrhart polynomials</a>, arXiv:math/9801008 [math.CO], 1998.
%H A210634 Andreas Blass, Bruce E. Sagan, <a href="http://dx.doi.org/10.1023/A:1008646303921">Characteristic and Ehrhart polynomials</a>, J. Algebraic Combin. 7 (1998), no. 2, 115--126. MR1609889 (99c:05204)
%H A210634 <a href="/index/Rec#order_12">Index entries for linear recurrences with constant coefficients</a>, signature (3,0,-7,3,6,0,-6,-3,7,0,-3,1).
%F A210634 G.f.: x^12*f(1)^3*f(2)^3*f(3) where f(k)=1/(1-x^k).
%F A210634 G.f.: x^12/((1-x)^3*(1-x^2)^3*(1-x^3)). - _Colin Barker_, Jul 22 2013
%t A210634 LinearRecurrence[{3,0,-7,3,6,0,-6,-3,7,0,-3,1},{0,0,0,0,0,0,0,0,0,0,0,0,1},60] (* _Harvey P. Dale_, Mar 27 2025 *)
%Y A210634 A164680 is similar but has a different offset.
%K A210634 nonn,easy
%O A210634 0,14
%A A210634 _N. J. A. Sloane_, Mar 25 2012