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A100515
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Denominator of Sum_{k=0..n} 1/C(3n,3k).
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2
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1, 1, 20, 42, 4620, 5005, 2042040, 1763580, 59491432, 95611230, 776363187600, 235953517800, 24067258815600, 143627189706, 12170010541088400, 34128942604356600, 245138783756209200, 1103648327722933300, 497725329469811592240, 94396183175309095080, 538372898043179538939600
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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REFERENCES
| M. Klamkin, ed., Problems in Applied Mathematics: Selections from SIAM Review, SIAM, 1990; see pp. 126-127.
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EXAMPLE
| 1, 2, 41/20, 85/42, 9287/4620, 10034/5005, 4089347/2042040, 3529889/1763580, 119042647/59491432, 191288533/95611230, 1553111566613/776363187600, ... = A100514/A100515
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CROSSREFS
| Cf. A100514, A100513, A046825.
Sequence in context: A075228 A128672 A126251 * A039322 A043145 A043925
Adjacent sequences: A100512 A100513 A100514 * A100516 A100517 A100518
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KEYWORD
| nonn,frac
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 25 2004
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