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Search: id:A156096
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| 1, 1, 4, 6, 18, 32, 84, 164, 400, 824, 1928, 4096, 9360, 20240, 45632, 99680, 223008, 489984, 1091392, 2405952, 5345536, 11806592, 26194048, 57917440, 128389376, 284057856, 629392384, 1393010176, 3085685248, 6830825472, 15128761344
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OFFSET
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0,3
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COMMENT
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A030186 = (1, 2, 7, 22, 71, 228, 733, 2356, 7573, 24342,...).
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FORMULA
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A007318^(-1) * A030186
a(n)=4*a(n-2)+2*a(n-3). G.f.: (1+x)/(1-4x^2-2x^3). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 10 2009]
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EXAMPLE
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a(3) = 6 = (-1, 3, -3, 1) dot (1, 2, 7, 22) = (-1, 6, -21, 22) = 6.
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CROSSREFS
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A030186
Sequence in context: A026623 A026689 A138276 this_sequence A088810 A005199 A107390
Adjacent sequences: A156093 A156094 A156095 this_sequence A156097 A156098 A156099
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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), Feb 03 2009
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 10 2009
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