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 A143424 Triangle read by rows, A054525 * A130123, 1<=k<=n. 2
 1, -1, 2, -1, 0, 4, 0, -2, 0, 8, -1, 0, 0, 0, 16, 1, -2, -4, 0, 0, 32, -1, 0, 0, 0, 0, 0, 64, 0, 0, 0, -8, 0, 0, 0, 128, 0, 0, -4, 0, 0, 0, 0, 0, 256, 1, -2, 0, 0, -16, 0, 0, 0, 0, 512, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1024, 0, 2, 0, -8, 0, -32, 0, 0, 0, 0, 0, 2048 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Row sums = A000740 starting with offset 1: (1, 1, 3, 6, 15, 27, 63,...). Left border = mu(n), A008683. LINKS Table of n, a(n) for n=1..78. FORMULA Mobius transform of A130123, where A130123 = an infinite lower triangular matrix with (1, 2, 4, 8,...) in the main diagonal and the rest zeros. EXAMPLE First few rows of the triangle = 1; -1, 2; -1, 0, 4; 0, -2, 0, 8; -1, 0, 0, 0, 16; 1, -2, -4, 0, 0, 32; -1, 0, 0, 0, 0, 0, 64; 0, 0, 0, -8, 0, 0, 0, 128; ... CROSSREFS Cf. A000740, A130123, A054525, A008683. Sequence in context: A088850 A363032 A185964 * A130125 A336517 A317552 Adjacent sequences: A143421 A143422 A143423 * A143425 A143426 A143427 KEYWORD tabl,sign AUTHOR Gary W. Adamson, Aug 14 2008 STATUS approved

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Last modified December 5 20:27 EST 2023. Contains 367594 sequences. (Running on oeis4.)