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Search: id:A127736
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| 1, 7, 21, 46, 85, 141, 217, 316, 441, 595, 781, 1002, 1261, 1561, 1905, 2296, 2737, 3231, 3781, 4390, 5061, 5797, 6601, 7476, 8425, 9451, 10557, 11746, 13021, 14385, 15841, 17392, 19041, 20791, 22645, 24606, 26677, 28861, 31161, 33580, 36121
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OFFSET
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1,2
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FORMULA
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A127735 * [1,1,1,...]
Row sums of triangle A134390. Also, binomial transform of [1, 6, 8, 3, 0, 0, 0,...). - Gary W. Adamson (qntmpkt(AT)yahoo.com), Oct 23 2007
a(n)=n*(n^2+2*n-1)/2=(n+1)*A000217(n)-n = A006002(n)-n. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 21 2009]
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CROSSREFS
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Cf. A127735, A127701, A002260.
Cf. A134390.
Sequence in context: A054569 A077354 A146411 this_sequence A146802 A147054 A146629
Adjacent sequences: A127733 A127734 A127735 this_sequence A127737 A127738 A127739
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KEYWORD
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nonn
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Jan 26 2007
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 21 2009
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