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Search: id:A145730
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| 0, 4, 40, 332, 2672, 21396, 171192, 1369564, 10956544, 87652388, 701219144, 5609753196, 44878025616, 359024204980, 2872193639896, 22977549119228, 183820392953888, 1470563143631172, 11764505149049448, 94116041192395660
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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 written as a+=(a+=(a+=n+a)).
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FORMULA
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a(n) = sum_{i=0..n} A108019(i).
a(n) = 4*(8^(n+1)-7n-8)/49 = 4*A014831(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+=n+s)); AppendTo[lst, s], {n, 0, 5!}]; lst
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CROSSREFS
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Cf. A108019.
Sequence in context: A061318 A043031 A121126 this_sequence A069721 A155641 A122652
Adjacent sequences: A145727 A145728 A145729 this_sequence A145731 A145732 A145733
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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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