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Search: id:A140423
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| A140423 |
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a(n) = sum{k=1 to n} k^(2^(n+1-k)). |
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+0
1
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| 1, 5, 26, 354, 72379, 4338080215, 18448597098193762724, 340282370354622283774333836315916425060, 115792089237316207213755562747271079374483128445080168204415615259394085515413
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(10) has 155 digits and is too large to show here. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 20 2008
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MAPLE
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a:=proc(n) options operator, arrow: sum(k^(2^(n+1-k)), k=1..n) end proc: seq(a(n), n=1..8); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 20 2008
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CROSSREFS
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Adjacent sequences: A140420 A140421 A140422 this_sequence A140424 A140425 A140426
Sequence in context: A106296 A060516 A077537 this_sequence A090644 A015490 A118366
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Jun 18 2008
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 20 2008
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