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Search: id:A079801
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| 1, 3, 6, 11, 33, 186, 2958, 48246, 19840326, 2510415286598, 521698566186280239801, 4471373101273208723788137885117929798, 1253543310663256238898448262146285580160101720412514117844237110598
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OFFSET
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1,2
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FORMULA
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For n>1, a(n) = A079800(n+1) - 1. Also, a(n) = (sqrt(8*(A079798(1) + A079798(2) + ... + A079798(n)) + 1) - 1) / 2. [From Max Alekseyev (maxale(AT)gmail.com), May 08 2009]
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CROSSREFS
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Cf. A079798, A079799, A079800.
Cf. A075634, A160277 [From Max Alekseyev (maxale(AT)gmail.com), May 08 2009]
Sequence in context: A101958 A153982 A119367 this_sequence A119104 A102253 A081513
Adjacent sequences: A079798 A079799 A079800 this_sequence A079802 A079803 A079804
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 05 2003
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EXTENSIONS
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Extended by Max Alekseyev (maxale(AT)gmail.com), May 08 2009
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