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A127466 Triangle read by rows: A054525 * A127481 as infinite lower triangular matrices.

%I A127466 #12 Sep 24 2018 16:53:14
%S A127466 1,2,2,3,0,6,4,4,0,8,5,0,0,0,20,6,6,12,0,0,12,7,0,0,0,0,0,42,8,8,0,16,
%T A127466 0,0,0,32,9,0,18,0,0,0,0,0,54,10,10,0,0,40,0,0,0,0,40
%N A127466 Triangle read by rows: A054525 * A127481 as infinite lower triangular matrices.
%C A127466 Mobius transform of A127481.
%F A127466 Sum_{k=1..n} T(n,k) = n^2.
%F A127466 T(n,n) = A002618(n) = n*phi(n).
%e A127466 First few rows of the triangle are:
%e A127466 1;
%e A127466 2, 2;
%e A127466 3, 0, 6;
%e A127466 4, 4, 0, 8;
%e A127466 5, 0, 0, 0, 20;
%e A127466 6, 6, 12, 0, 0, 12;
%e A127466 7, 0, 0, 0, 0, 0, 42;
%e A127466 8, 8, 0, 16, 0, 0, 0, 32;
%e A127466 ...
%p A127466 A127466 := proc(n,k)
%p A127466     add( A054525(n,j)*A127481(j,k),j=k..n) ;
%p A127466 end proc: # _R. J. Mathar_, Sep 06 2013
%Y A127466 Cf. A054522, A127093, A062952, A002618.
%Y A127466 Cf. A127093, A127481, A054525.
%K A127466 nonn,tabl
%O A127466 1,2
%A A127466 _Gary W. Adamson_, Jan 15 2007
%E A127466 Edited by _N. J. A. Sloane_ at the suggestion of _Andrew S. Plewe_, Aug 23 2007