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Search: id:A119336
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| A119336 |
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Expansion of (1-x)^4/((1-x)^6-x^6). |
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+0
2
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| 1, 2, 3, 4, 5, 6, 8, 16, 45, 130, 341, 804, 1730, 3460, 6555, 12016, 21845, 40410, 77540, 155080, 320001, 669526, 1398101, 2884776, 5858126, 11716252, 23166783, 45536404, 89478485, 176565486, 350739488, 701478976, 1410132405, 2841788170
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Row sums of A119335. Binomial transform of (1+x)/(1-x)^6.
Equals binomial transform of [1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1,...] [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Mar 14 2009]
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FORMULA
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a(n)=sum{k=0..n, sum{j=0..n-k, C(k,3j)C(n-k,3j)}}
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CROSSREFS
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Sequence in context: A048318 A037402 A048332 this_sequence A133706 A081710 A128421
Adjacent sequences: A119333 A119334 A119335 this_sequence A119337 A119338 A119339
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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), May 14 2006
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