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Search: id:A132477
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OFFSET
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0,2
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COMMENT
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A007283 = 3*2^n: (3, 6, 12, 24, 48,...).
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FORMULA
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a(0) = 1, a(1) = 4, a(n) = 3*2^n for n>1.
G.f.: -(1+2*x+4*x^2)/(-1+2*x). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 14 2007
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EXAMPLE
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a(3) = 24 = sum of row 3 terms of triangle A132476: (3 + 7 + 13 + 1).
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CROSSREFS
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Cf. A132476, A007283.
Sequence in context: A008195 A001209 A128624 this_sequence A102651 A102652 A143270
Adjacent sequences: A132474 A132475 A132476 this_sequence A132478 A132479 A132480
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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), Aug 22 2007
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