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 A132168 #2 Mar 31 2012 13:20:14 %S A132168 1,20,295,3485,33496,247799,1010905,-7422100,-238118825,-3513857515, %T A132168 -38530770320,-329008652665,-1926925302575,-594574697500, %U A132168 188633380315975,3451130126965325,42502627523897800,406764806549554775,2912899847916711625 %N A132168 Alternating row sums of triangle A132166 (s1(7)). %F A132168 a(n)=sum(A132166(n,m)*(-1)^(m-1),m=1..n), n>=1. %F A132168 O.g.f.: g(x)/(1+g(x)) with g(x)=(1-(1-6*x)^6)/(36*(1-6*x)^6), o.g.f. first column of A132166. %Y A132168 Cf. A132167 (row sums of A132166). %K A132168 sign,easy %O A132168 1,2 %A A132168 _Wolfdieter Lang_ Oct 12 2007