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 A159756 #3 Sep 08 2013 13:31:39
%S A159756 0,1,-1,4,-1,-2,12,0,-3,-3,32,4,-4,-5,-4,80,16,-4,-8,-7,-5,192,48,0,
%T A159756 -12,-12,-9,-6,448,128,16,-16,-20,-16,-11,-7,1024,320,64,-16,-32,-28,
%U A159756 -20,-13,-8,2304,768,192,0,-48,-48,-36,-24,-15,-9
%N A159756 Triangle A159755 reversed .
%F A159756 Sum_{k=0..n} T(n,k) = A045618(n-2) for n>=2 . T(2n,n)=-A001787(n).
%e A159756 Triangle begins : 0 ; 1,-1 ; 4,-1,-2 ; 12,0,-3,-3 ; 32,4,-4,-5,-4 ; ...
%Y A159756 Cf. A062111, A152920
%K A159756 sign,tabl
%O A159756 0,4
%A A159756 _Philippe Deléham_, Apr 21 2009