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 A128409 Triangle read by rows: A000012 * A128408 as infinite lower triangular matrices. 1
 1, 0, -1, -1, -1, -1, -1, -1, -1, 0, -2, -1, -1, 0, -1, -1, 0, 0, 0, -1, 1, -2, 0, 0, 0, -1, 1, -1, -2, 0, 0, 0, -1, 1, -1, 0, -2, 0, 0, 0, -1, 1, -1, 0, 0, -1, 1, 0, 0, 0, 1, -1, 0, 0, 1, -2, 1, 0, 0, 0, 1, -1, 0, 0, 1, -1, -2, 1, 0, 0, 0, 1, -1, 0, 0, 1, -1, 0, -3, 1, 0, 0, 0, 1, -1, 0, 0, 1, -1, 0, -1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,11 COMMENTS Left border = the Mertens sequence: A002321: (1, 0, -1, -1, -2, ...). Right border = mu(n), A008683: (1, -1, -1, 0, -1, 1, -1, ...). Row sums = A062563: (1, -1, -3, -3, -5, -1, -3, ...). LINKS Table of n, a(n) for n=1..91. EXAMPLE First few rows of the triangle: 1; 0, -1; -1, -1, -1; -1, -1, -1, 0; -2, -1, -1, 0, -1; -1, 0, 0, 0, -1, 1; -2, 0, 0, 0, -1, 1, -1; ... CROSSREFS Cf. A002321, A008683, A062563, A128407, A128408. Sequence in context: A171400 A271592 A357187 * A133699 A157361 A224444 Adjacent sequences: A128406 A128407 A128408 * A128410 A128411 A128412 KEYWORD tabl,sign,changed AUTHOR Gary W. Adamson, Mar 01 2007 EXTENSIONS Previous a(51) = 0 removed and more terms from Georg Fischer, Jun 08 2023 STATUS approved

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Last modified June 10 06:58 EDT 2023. Contains 363195 sequences. (Running on oeis4.)