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 A107506 #15 May 14 2024 03:28:01 %S A107506 1,220,9482,166188,1660450,11260876,57581898,237782204,831240322, %T A107506 2543995388,6986455498,17539148684,40829208354,89125931884, %U A107506 184069213834,362272019868,683489419778,1242224123932,2183844052874,3726523300588,6190586013986,10037135290380 %N A107506 Coordination sequence for D_11 lattice. %H A107506 <a href="/index/Rec#order_11">Index entries for linear recurrences with constant coefficients</a>, signature (11,-55,165,-330,462,-462,330,-165,55,-11,1). %F A107506 G.f.: -(x +1)*(x^10 +208*x^9 +6909*x^8 +66912*x^7 +251010*x^6 +392864*x^5 +251010*x^4 +66912*x^3 +6909*x^2 +208*x +1) / (x -1)^11. [_Colin Barker_, Nov 20 2012] %Y A107506 Cf. A007900. %K A107506 nonn,easy %O A107506 0,2 %A A107506 _N. J. A. Sloane_, May 28 2005