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Search: id:A128265
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| A128265 |
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a(n) = sum{m=1 to n} LCM(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. (a(n) = sum of terms in n-th row of triangle A128264.). |
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+0
2
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| 1, 2, 6, 90, 360, 10185, 80388, 4251198, 386596014, 5895746318, 42232772098, 7792102093721, 89950696066660, 1573136478232189, 948484950999782040, 892212203897135193546, 18041218934546986331084
(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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FORMULA
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T(n,m)=lcm[A008277(n,m),|A008275(n,m)|]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 24 2007
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MAPLE
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A128264 := proc(n, m) lcm(combinat[stirling1](n, m), combinat[stirling2](n, m)) ; end: A128265 := proc(n) local m; add( A128264(n, m), m=1..n) ; end: seq(A128265(n), n=1..30) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 24 2007
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CROSSREFS
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Cf. A128264.
Sequence in context: A118537 A109892 A055702 this_sequence A087277 A007188 A129364
Adjacent sequences: A128262 A128263 A128264 this_sequence A128266 A128267 A128268
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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 R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 24 2007
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