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Search: id:A059420
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| 1, 20, 616, 28160, 1805056, 154918400, 17171485696, 2389096202240, 407776690241536, 83793407533383680, 20407552701432856576, 5813146553630295326720, 1914890082050142493474816
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 259.
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FORMULA
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a(n)= A059419(2*n+1, 3). From the expansion of tan(x)^3/6.
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CROSSREFS
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Cf. A059419.
Sequence in context: A116218 A035279 A015268 this_sequence A129906 A125722 A006410
Adjacent sequences: A059417 A059418 A059419 this_sequence A059421 A059422 A059423
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Jan 30 2001
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EXTENSIONS
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More terms from Larry Reeves (larryr(AT)acm.org), Feb 08 2001. Corrected and extended by Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Feb 09 2001.
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