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Search: id:A133124
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OFFSET
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0,2
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FORMULA
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Binomial transform of [1, 2, 2, 3, 2, 3, 2, 3, 2,...]. a(n) = 2^(n+1) + 2^(n-1) - (n+1).
Row sums of triangle A133938. - Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 29 2007
G.f.: 1-x*(3-5*x+3*x^2)/(-1+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) = (1, 3, 3, 1) dot (1, 2, 2, 3) = (1 + 6 + 6 + 3).
a(5) = 74 = 2^6 + 2^4 - 6 = 64 + 16 - 6.
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CROSSREFS
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Cf. A000079.
Cf. A133938.
Adjacent sequences: A133121 A133122 A133123 this_sequence A133125 A133126 A133127
Sequence in context: A054455 A026734 A026767 this_sequence A104004 A101509 A099325
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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 19 2007
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