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 A127444 Triangle defined as the matrix product A051731*A127442, read by rows. 0
 1, 2, -2, 2, -2, 0, 3, -4, 0, 1, 2, -2, 0, 1, -1, 4, -6, 0, 1, -1, 2, 2, -2, 0, 1, -1, 2, -2, 4, -6, 0, 2, -1, 2, -2, 1, 3, -4, 0, 1, -1, 2, -2, 1, 0, 4, -6, 0, 2, -2, 2, -2, 1, 0, 1, 2, -2, 0, 1, -1, 2, -2, 1, 0, 1, -2, 6, -10, 0, 3, -2, 4, -2, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row sums = 0. LINKS FORMULA T(n,k) = sum_{j=k..n} A051731(n,j)*A127442(j,k) = sum_{j=k..n, j|n} A127442(j,k), 1<=k<=n. EXAMPLE First few rows of the triangle are: 1; 2, -2; 2, -2, 0; 3, -4, 0, 1; 2, -2, 0, 1, -1; 4, -6, 0, 1, -1, 2; 2, -2, 0, 1, -1, 2, -2; ... CROSSREFS Cf. A000005 (column k=1), A051731, A127442. Sequence in context: A214666 A320471 A333180 * A241477 A268243 A159782 Adjacent sequences:  A127441 A127442 A127443 * A127445 A127446 A127447 KEYWORD tabl,easy,sign AUTHOR Gary W. Adamson, Jan 14 2007 STATUS approved

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Last modified May 13 23:41 EDT 2021. Contains 343868 sequences. (Running on oeis4.)