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Search: id:A133600
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OFFSET
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1,2
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FORMULA
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For even indexed terms, a(n) = 2^n. For odd indexed terms, a(n) = 7 * 2^(n-3).
G.f.: -x*(x+1)*(3*x+1)/(2*x-1)/(2*x+1). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 14 2007
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EXAMPLE
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a(4) = 16 = sum of row 4 terms of triangle A133599 = (3 + 7 + 5 + 1).
a(4) = 16 = 2^4.
a(7) = 112 = 7 * 2^4 = 7 * 16.
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CROSSREFS
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Cf. A133599.
Sequence in context: A005513 A025619 A093210 this_sequence A051049 A108122 A027609
Adjacent sequences: A133597 A133598 A133599 this_sequence A133601 A133602 A133603
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KEYWORD
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nonn
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 18 2007
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