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Search: id:A134825
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| 1, 0, -1, 0, -1, 0, -1, 1, -8, 54, -530, 6192, -86581, 1425517, -27298232, 601580873, -15116315768, 429614643061, -13711655205089, 488332318973593, -19296579341940069, 841693047573682615, -40338071854059455414, 2115074863808199160560, -120866265222965259346028
(list; graph; listen)
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OFFSET
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0,9
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REFERENCES
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C. J. Moreno and S. S. Wagstaff, Jr., Sums of Squares of Integers, Chapman & Hall, 2006, p. 107.
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FORMULA
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a(n)=floor(B_(2n)), n>=0, with B_{2n}= A000367(n)/A002445(n)= A027641(2n)/A027642(2n).
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EXAMPLE
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n=4: B_8=-1/30=-0,033... hence a(4)=-1.
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CROSSREFS
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Sequence in context: A079754 A138403 A013499 this_sequence A052690 A027525 A080312
Adjacent sequences: A134822 A134823 A134824 this_sequence A134826 A134827 A134828
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KEYWORD
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sign,easy
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Nov 13 2007
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