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Search: id:A132899
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OFFSET
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1,2
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FORMULA
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Given the sequence S = (1, -2, 3, -4, 5, -6, 7,...), a(n) = (n*S(n) - n + SUM_{1,n}:S(n)).
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EXAMPLE
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a(4) = 22 = sum of row 4 terms of triangle A132898: (-4, -7, -2, -9).
a(4) = 22 = n*S(n) - n + SUM_{1,n}:S(n) = 4*(-4) - 4 + (1, -2, 3, -4) = -16 -4 - 2.
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CROSSREFS
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Cf. A132898.
Sequence in context: A165432 A152043 A060291 this_sequence A051175 A058537 A002362
Adjacent sequences: A132896 A132897 A132898 this_sequence A132900 A132901 A132902
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KEYWORD
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sign
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 03 2007
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