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 A127470 Triangle equal to the matrix product A127466 * A051731. 2
 1, 4, 2, 9, 0, 6, 16, 12, 0, 8, 25, 0, 0, 0, 20, 36, 18, 24, 0, 0, 12, 49, 0, 0, 0, 0, 0, 42, 64, 56, 0, 48, 0, 0, 0, 32, 81, 0, 72, 0, 0, 0, 0, 0, 54, 100, 50, 0, 0, 80, 0, 0, 0, 0, 40, 121, 0, 0, 0, 0, 0, 0, 0, 0, 0, 110, 144, 108, 96, 72, 0, 72, 0, 0, 0, 0, 0, 48 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS FORMULA T(n,1) = n^2. T(n,n) = n*phi(n) = A002618(n). EXAMPLE First few rows of the triangle are: 1; 4, 2; 9, 0, 6; 16, 12, 0, 8; 25, 0, 0, 0, 20; 36, 18, 24, 0, 0, 12; 49, 0, 0, 0, 0, 0, 42; 64, 56, 0, 48, 0, 0, 0, 32; 81, 0, 72, 0, 0, 0, 0, 0, 54; ... MAPLE A127470 := proc(n, k)     add( A127466(n, j)*A051731(j, k), j=k..n) ; end proc: # R. J. Mathar, Sep 08 2013 CROSSREFS Cf. A127466, A051731, A127469 (row sums), A061949. Sequence in context: A190477 A143311 A016696 * A199449 A010649 A067721 Adjacent sequences:  A127467 A127468 A127469 * A127471 A127472 A127473 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Jan 15 2007 EXTENSIONS Terms corrected by R. J. Mathar, Sep 08 2013 STATUS approved

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Last modified May 26 00:32 EDT 2020. Contains 334613 sequences. (Running on oeis4.)