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A127511
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a(n) = mu(n) * 2^(n-1).
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4
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1, -2, -4, 0, -16, 32, -64, 0, 0, 512, -1024, 0, -4096, 8192, 16384, 0, -65536, 0, -262144, 0, 1048576, 2097152, -4194304, 0, 0, 33554432, 0, 0, -268435456, -536870912, -1073741824, 0, 4294967296, 8589934592, 17179869184, 0, -68719476736, 137438953472, 274877906944, 0, -1099511627776
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OFFSET
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1,2
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COMMENTS
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Appears to be the determinant of A156734 where the element in the lower right corner has been swapped with the element in the upper right corner. - Mats Granvik, Feb 14 2009
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LINKS
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FORMULA
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EXAMPLE
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a(5) = (-1)*16 = -16 since mu(5) = -1 and 2^4 = 16.
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MAPLE
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A127511 := proc(n) 2^(n-1)*numtheory[mobius](n) ; end: for n from 1 to 50 do printf("%d, ", A127511(n)) ; od ; # R. J. Mathar, May 19 2007
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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