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Search: id:A145729
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| 0, 8, 80, 664, 5344, 42792, 342384, 2739128, 21913088, 175304776, 1402438288, 11219506392, 89756051232, 718048409960, 5744387279792, 45955098238456, 367640785907776, 2941126287262344, 23529010298098896, 188232082384791320
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OFFSET
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0,2
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COMMENT
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In a C/C++ style of notation, the update from a(n-1) to a(n) can be formulated as a+=(a+=(a+=(a+=n))).
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FORMULA
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a(n) = sum_{i=0..n-1} A052379(i).
a(n) = 8*(8^(n+1)-7n-8)/49 = 8*A014831(n) = 2*A145730(n). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 21 2008
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MATHEMATICA
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lst={}; s=0; Do[s+=(s+=(s+=(s+=n))); AppendTo[lst, s], {n, 0, 5!}]; lst
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CROSSREFS
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Cf. A052379.
Sequence in context: A043035 A165760 A166157 this_sequence A024101 A155144 A136949
Adjacent sequences: A145726 A145727 A145728 this_sequence A145730 A145731 A145732
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KEYWORD
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nonn
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), Oct 17 2008
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 21 2008
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