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Search: id:A135032
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| A135032 |
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Generalized Fibonacci numbers: a(n) = 6*a(n-1) + 4*a(n-2). |
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+0
1
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| 0, 1, 6, 40, 264, 1744, 11520, 76096, 502656, 3320320, 21932544, 144876544, 956989440, 6321442816, 41756614656, 275825459200, 1821979213824, 12035177119744, 79498979573760, 525134585921536, 3468803433824256
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OFFSET
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0,3
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FORMULA
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a(0)=0; a(1)=1; a(n)=2*(3*a(n-1)+2*a(n-2)). a(n)=1/(2*sqrt(13))*((3+sqrt(13))^n-(3-sqrt(13))^n).
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CROSSREFS
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Adjacent sequences: A135029 A135030 A135031 this_sequence A135033 A135034 A135035
Sequence in context: A026077 A065113 A052518 this_sequence A122074 A123357 A081016
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KEYWORD
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nonn,easy
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AUTHOR
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Rolf Pleisch (r_pleisch(AT)gmx.ch), Feb 10 2008, corrected Feb 14 2008
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EXTENSIONS
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More terms from Alexis Olson (AlexisOlson(AT)gmail.com), Nov 15 2008
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