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Search: id:A128266
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| A128266 |
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a(n) = sum{m=1 to n} GCD(s(n,m),S(n,m)), where s(n,m) is an unsigned Stirling number of the first kind and S(n,m) is a Stirling number of the second kind. |
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+0
2
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| 1, 2, 5, 9, 22, 68, 163, 136, 525, 14519, 3918, 5954, 26561, 23897, 875479, 464545, 303146, 1576515, 15328385, 1297494, 25992621, 92698823, 64096034, 31484634, 16667307085, 737157766, 397339059223, 115011291216, 30816653208, 4304179162
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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MAPLE
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with(combinat): T:=(n, k)->gcd(abs(stirling1(n, k)), stirling2(n, k)): seq(add(T(n, k), k=1..n), n=1..35); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Feb 25 2007
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CROSSREFS
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Sequence in context: A029726 A052962 A002935 this_sequence A088356 A047044 A109621
Adjacent sequences: A128263 A128264 A128265 this_sequence A128267 A128268 A128269
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet Feb 22 2007
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Feb 25 2007
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