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Search: id:A102303
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| A102303 |
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(1/6)*[7^(n+1) - 3*(-1)^n + 2 ]. |
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+0
1
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| 1, 9, 57, 401, 2801, 19609, 137257, 960801, 6725601, 47079209, 329554457, 2306881201, 16148168401, 113037178809, 791260251657, 5538821761601, 38771752331201, 271402266318409, 1899815864228857, 13298711049602001
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n) = Sum[7^i, {i, 0, n}] + 1 - Mod[Sum[7^i, {i, 0, n}], 2]
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MATHEMATICA
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a = Table[Sum[7^i, {i, 0, n}] + 1 - Mod[Sum[7^i, {i, 0, n}], 2], {n, 0, 50}]
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CROSSREFS
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Sequence in context: A045635 A026896 A080961 this_sequence A009060 A112616 A012089
Adjacent sequences: A102300 A102301 A102302 this_sequence A102304 A102305 A102306
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KEYWORD
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nonn
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Mar 15 2005
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EXTENSIONS
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Edited by njas, May 29 2007
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