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 A112966 #11 Jan 27 2014 15:24:23 %S A112966 0,0,1,0,-1,-1,-1,-2,-3,-2,-2,-1,-3,-3,-4,0,-6,-1,-4,-1,-3,-3,-7,0,-5, %T A112966 -3,-3,0,-5,1,-5,-2,-10,-1,-8,4,-8,-3,-4,2,-6,0,-5,-1,-4,-2,-11,3,-8, %U A112966 -1,-8,-1,-11,2,-8,2,-7,-3,-9,5,-2,-5,-7,2,-11,7,-6,0,-4,1,-9,4,-12,-3,-6,0,-10,2,-7,-1,-10,-8,-12,6,-13,-2,-12,0 %N A112966 Sum(mu(i)*omega(j): i+j=n), with mu=A008683 and omega=A001221. %H A112966 Reinhard Zumkeller, <a href="/A112966/b112966.txt">Table of n, a(n) for n = 1..10000</a> %e A112966 a(5)=mu(1)*omega(4)+mu(2)*omega(3)+mu(3)*omega(2)+mu(4)*omega(1) %e A112966 = 1*1 - 1*1 - 1*1 + 0*0 = -1. %o A112966 (Haskell) %o A112966 a112966 n = sum $ zipWith (*) %o A112966 a008683_list $ reverse $ take (n - 1) a001221_list %o A112966 -- _Reinhard Zumkeller_, Feb 29 2012 %Y A112966 Cf. A013939, A112965, A068341, A112962, A112963, A112964, A112968. %K A112966 sign,look %O A112966 1,8 %A A112966 _Reinhard Zumkeller_, Oct 07 2005