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A100517
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Denominator of Sum_{k=0..n} 1/C(n,k)^2.
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4
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1, 1, 4, 9, 72, 10, 3600, 1575, 2800, 1764, 14112, 13475, 34927200, 2316600, 192192, 4459455, 4994589600, 262061800, 735869534400, 17476901442, 422721728, 353723760, 31127690880, 10150725585, 59637542956992, 2205530434800, 155748568976000, 50956005028500
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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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. A100516, A046825.
Sequence in context: A069020 A122956 A041777 * A041597 A041030 A061104
Adjacent sequences: A100514 A100515 A100516 * A100518 A100519 A100520
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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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