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 A143319 Triangle read by rows, A051731 * A143318; 1<=k<=n. 1
 1, 3, -1, 4, -1, -1, 7, -4, 0, 0, 6, -1, -1, -1, -1, 12, -8, -3, 1, 1, 1, 8, -1, -1, -1, -1, -1, -1, 15, -11, 0, 0, 0, 0, 0, 0, 13, -5, -5, 0, 0, 0, 0, 0, 0, 18, -10, -3, -3, -3, 1, 1, 1, 1, 1, 12, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 28, -27, -4, 4, 4, 4, 0, 0, 0, 0, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Left border = sigma(n), A000203. Right border = mu(n) A008683. Row sums = d(n), A000005. LINKS FORMULA Triangle read by rows, A051731 * A143318; 1<=k<=n EXAMPLE First few rows of the triangle = 1; 3, -1; 4, -1, -1; 7, -4, 0, 0; 6, -1, -1, -1, -1; 12, -8, -3, -1, -1, -1; 8, -1, -1, -1, -1, -1, -1; ... CROSSREFS Cf. A143318, A000005, A008683, A000203, A051731. Sequence in context: A130314 A127057 A143355 * A078011 A010285 A159878 Adjacent sequences:  A143316 A143317 A143318 * A143320 A143321 A143322 KEYWORD tabl,sign AUTHOR Gary W. Adamson, Aug 07 2008 STATUS approved

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Last modified October 16 04:02 EDT 2018. Contains 316259 sequences. (Running on oeis4.)