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Search: id:A111686
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| A111686 |
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(n+1) + (n+1)(n+2) + ..., with n terms. |
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+0
2
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| 2, 15, 144, 1925, 33648, 726327, 18636560, 553680369, 18684924840, 705833193923, 29502690532392, 1351724235304365, 67359683340291104, 3627011494019437935, 209846445862386234528, 12982402818188717219657, 855210841645834409812920
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Eric Weisstein's World of Mathematics, Rising Factorial.
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EXAMPLE
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a(3) = 4+ 4*5 +4*5*6 = 144.
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MAPLE
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a:=n->sum((n+j)!, j=1..n)/n!: seq(a(n), n=1..18); # (Deutsch)
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CROSSREFS
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Cf. A111685, A054654.
Sequence in context: A140306 A143924 A005415 this_sequence A001854 A060226 A002103
Adjacent sequences: A111683 A111684 A111685 this_sequence A111687 A111688 A111689
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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), Aug 16 2005
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EXTENSIONS
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a(6)-a(10) from Jonathan Vos Post (jvospost3(AT)gmail.com) Aug 17 2005
More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 27 2005
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