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Search: id:A077866
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| A077866 |
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Expansion of (1-x)^(-1)/(1-x-2*x^2+2*x^3). |
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+0
3
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| 1, 2, 5, 8, 15, 22, 37, 52, 83, 114, 177, 240, 367, 494, 749, 1004, 1515, 2026, 3049, 4072, 6119, 8166, 12261, 16356, 24547, 32738, 49121, 65504, 98271, 131038, 196573, 262108, 393179, 524250, 786393, 1048536, 1572823, 2097110, 3145685, 4194260, 6291411, 8388562
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Equals triangle A122196 * [1,2,4,8,16,...]. [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Nov 29 2008]
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FORMULA
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a(n)=2^(n/2)(3+2sqrt(2)+(3-2sqrt(2))(-1)^n)-n-5. - Paul Barry (pbarry(AT)wit.ie), Apr 23 2004
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CROSSREFS
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Bisections are A005803 and A050488.
A122196 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Nov 29 2008]
Sequence in context: A103077 A090980 A024808 this_sequence A098894 A121641 A058884
Adjacent sequences: A077863 A077864 A077865 this_sequence A077867 A077868 A077869
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002
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