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Search: id:A084860
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| A084860 |
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Expansion of (1-2x+2x^2-x^3)/(1-2x)^2. |
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+0
4
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| 1, 2, 6, 15, 36, 84, 192, 432, 960, 2112, 4608, 9984, 21504, 46080, 98304, 208896, 442368, 933888, 1966080, 4128768, 8650752, 18087936, 37748736, 78643200, 163577856, 339738624, 704643072, 1459617792, 3019898880, 6241124352
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OFFSET
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0,2
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COMMENT
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Partial sums are A084858. Partial sums of A084860.
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FORMULA
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a(0)=1, a(n+1)=3*2^(n-2)(n+3)-0^n/4.
Equals binomial transform of nonzero terms of A026741: (1, 1, 3, 2, 5, 3, 7, 4,...). - Gary W. Adamson (qntmpkt(AT)yahoo.com), Apr 25 2008
Equals row sums of triangle A139633 - Gary W. Adamson (qntmpkt(AT)yahoo.com), Apr 27 2008
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CROSSREFS
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Cf. A026741.
Cf. A139633.
Adjacent sequences: A084857 A084858 A084859 this_sequence A084861 A084862 A084863
Sequence in context: A090982 A136302 A116404 this_sequence A084798 A017923 A018018
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Jun 12 2003
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