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A100516
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Numerator of Sum_{k=0..n} 1/C(n,k)^2.
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6
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1, 2, 9, 20, 155, 21, 7441, 3224, 5697, 3575, 28523, 27183, 70357417, 4661447, 386395, 8959408, 10028928779, 525966759, 1476346738309, 35051863075, 847581175, 709068173, 62385202783, 20340152122, 119483756745025, 4418168441921, 311960929172031
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| H. W. Gould, Combinatorial Identities, Morgantown, 1972, p. 50.
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EXAMPLE
| 1, 2, 9/4, 20/9, 155/72, 21/10, 7441/3600, 3224/1575, 5697/2800, 3575/1764, 28523/14112, 27183/13475, 70357417/34927200, 4661447/2316600, ... = A100516/A100517
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CROSSREFS
| Cf. A100517, A046825, A100518.
Sequence in context: A093835 A041007 A002360 * A041285 A002888 A041963
Adjacent sequences: A100513 A100514 A100515 * A100517 A100518 A100519
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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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