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Search: id:A054779
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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
1
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| 0, 720, 665280, 13366080, 96909120, 427518000, 1402410240, 3776965920, 8835488640, 18595558800, 36045979200, 65418312960, 112492013760, 184933148400, 292666711680, 448282533600, 667474778880, 969515038800
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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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
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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
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Adjacent sequences: A054776 A054777 A054778 this_sequence A054780 A054781 A054782
Sequence in context: A047803 A008411 A003439 this_sequence A030185 A010799 A075754
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KEYWORD
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easy,nonn
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AUTHOR
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Henry Bottomley (se16(AT)btinternet.com), May 19 2000
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