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 A143354 Triangle read by rows, (A051731)^4 * A128407, 1<=k<=n. 2
 1, 4, -1, 4, 0, -1, 10, -4, 0, 0, 4, 0, 0, 0, -1, 16, -4, -4, 0, 0, 1, 4, 0, 0, 0, 0, 0, -1, 20, -10, 0, 0, 0, 0, 0, 0, 10, 0, -4, 0, 0, 0, 0, 0, 0, 16, -4, 0, 0, -4, 0, 0, 0, 0, 1, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 40, -16, -10, 0, 0, 4, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Left border = A007426. Right border = mu(n), A008683. Row sums = A007425: (1, 3, 3, 6, 3, 9,...). LINKS Table of n, a(n) for n=1..90. FORMULA Triangle read by rows, (A051731)^4 * A128407, 1<=k<=n EXAMPLE First few rows of the triangle = 1; 4, -1; 4, 0, -1; 10, -4, 0, 0; 4, 0, 0, 0, 0, -1; 16, -4, -4, 0, 0, 1; 4, 0, 0, 0, 0, 0, -1; 10, -10, 0, 0, 0, 0, 0, 0; ... CROSSREFS Cf. A051731, A128407, A007425, A007426, A008663. Sequence in context: A229672 A298568 A152890 * A324026 A171539 A106141 Adjacent sequences: A143351 A143352 A143353 * A143355 A143356 A143357 KEYWORD tabl,sign AUTHOR Gary W. Adamson, Aug 10 2008 STATUS approved

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Last modified September 27 05:14 EDT 2023. Contains 365674 sequences. (Running on oeis4.)