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 A112335 #14 Jan 05 2021 21:56:46
%S A112335 1,-1,-4,-7,-10,-13,-16,-19,-22,-25,-28,-31,-34,-37,-40,-43,-46,-49,
%T A112335 -52,-55,-58,-61,-64,-67,-70,-73,-76,-79,-82,-85,-88,-91,-94,-97,-100,
%U A112335 -103,-106,-109,-112,-115,-118,-121,-124,-127,-130,-133,-136,-139,-142,-145,-148,-151,-154,-157,-160,-163,-166,-169
%N A112335 Row sums of number triangle A112334.
%H A112335 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1)
%F A112335 G.f.: (1-3x-x^2)/(1-x)^2.
%F A112335 E.g.f.: exp(x)*(2-3x)-1.
%F A112335 a(n) = 2 - 3n - 0^n.
%t A112335 LinearRecurrence[{2,-1},{1,-1,-4},60] (* _Harvey P. Dale_, Apr 21 2016 *)
%Y A112335 Cf. A016777.
%K A112335 easy,sign
%O A112335 0,3
%A A112335 _Paul Barry_, Sep 04 2005