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 A110332 #5 Jun 13 2015 00:51:52 %S A110332 1,-2,-1,-4,-5,-6,-11,-8,-19,-10,-29,-12,-41,-14,-55,-16,-71,-18,-89, %T A110332 -20,-109,-22,-131,-24,-155,-26,-181,-28,-209,-30,-239,-32,-271,-34, %U A110332 -305,-36,-341,-38,-379,-40,-419,-42,-461,-44,-505,-46,-551,-48,-599,-50,-649,-52,-701,-54,-755,-56,-811,-58,-869,-60,-929 %N A110332 Diagonal sums of number a triangle related to the Pell numbers. %C A110332 Diagonal sums of number triangle A110330. %H A110332 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (0,3,0,-3,0,1) %F A110332 G.f.: (1-2x-4x^2+2x^3+x^4)/((1+x)^3(1-x)^3); a(n)=3a(n-2)-3a(n-4)+a(n-6); a(n)=-n(n+6)/8-(n^2-2n-8)(-1)^n/8. %Y A110332 Cf. A028387 (bisection), A005843 (bisection). %K A110332 easy,sign %O A110332 0,2 %A A110332 _Paul Barry_, Jul 20 2005