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