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 A180009 Triangle T(n,k) read by rows. T(n,1) = mu(n), T(n,2)=T(n,k-1)-T(n-1,k), k>2: T(n,k)= (sum from i = 1 to k-1 of T(n-i,k-1)) - (sum from i = 1 to k-1 of T(n-i,k)). 1
 1, -1, -1, -1, 0, -1, 0, 0, 0, -1, -1, -1, 1, 0, -1, 1, 2, -2, 1, 0, -1, -1, -3, 2, -1, 1, 0, -1, 0, 3, -1, 1, -1, 1, 0, -1, 0, -3, -1, -2, 2, -1, 1, 0, -1, 1, 4, 2, 2, -3, 2, -1, 1, 0, -1, -1, -5, 0, -1, 1, -2, 2, -1, 1, 0, -1, 0, 5, -3, 2, 1, 0, -2, 2, -1, 1, 0, -1, -1, -6, 3, -4, 0, 0, 1, -2 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,17 LINKS EXAMPLE Table begins: 1, -1,-1, -1,0,-1, 0,0,0,-1, -1,-1,1,0,-1, 1,2,-2,1,0,-1, -1,-3,2,-1,1,0,-1, 0,3,-1,1,-1,1,0,-1, 0,-3,-1,-2,2,-1,1,0,-1, 1,4,2,2,-3,2,-1,1,0,-1, -1,-5,0,-1,1,-2,2,-1,1,0,-1, 0,5,-3,2,1,0,-2,2,-1,1,0,-1, -1,-6,3,-4,0,0,1,-2,2,-1,1,0,-1, 1,7,-1,3,0,2,-1,1,-2,2,-1,1,0,-1, 1,-6,-1,-2,-2,-3,1,0,1,-2,2,-1,1,0,-1, PROG (Other) (Excel cell formula European dot comma style) =if(column()=1; 1; if(row()>=column(); if(column()=2; sum(indirect(address(row(); column()-1; 4)))-sum(indirect(address(row()-1; column(); 4))); sum(indirect(address(row()-column()+1; column()-1; 4)&":"&address(row()-1; column()-1; 4); 4))-sum(indirect(address(row()-column()+1; column(); 4)&":"&address(row()-1; column(); 4); 4))); 0)) CROSSREFS Cf. A180010, A008683. Sequence in context: A055800 A060572 A163543 * A180010 A003406 A226289 Adjacent sequences:  A180006 A180007 A180008 * A180010 A180011 A180012 KEYWORD sign,tabl AUTHOR Mats Granvik, Aug 06 2010 STATUS approved

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