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A054779
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6n*(6n-1)*(6n-2)*(6n-3)*(6n-4)*(6n-5).
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0
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0, 720, 665280, 13366080, 96909120, 427518000, 1402410240, 3776965920, 8835488640, 18595558800, 36045979200, 65418312960, 112492013760, 184933148400, 292666711680, 448282533600, 667474778880, 969515038800
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| R. Tijdeman, Some applications of Diophantine approximation, pp. 261-284 of Surveys in Number Theory (Urbana, May 21, 2000), ed. M. A. Bennett et al., Peters, 2003.
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FORMULA
| a(n)= A053625(6n)=(6n)!/(6(n-1))!
Sum_{n>0} 1/a(n) = (192*log 2 - 81*log 3 - 7*Pi*sqrt 3)/4320 (cf. Tijdeman).
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CROSSREFS
| Sequence in context: A008411 A003439 A145093 * A030185 A010799 A075754
Adjacent sequences: A054776 A054777 A054778 * A054780 A054781 A054782
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KEYWORD
| easy,nonn
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AUTHOR
| Henry Bottomley (se16(AT)btinternet.com), May 19 2000
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