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A180267
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Prime(2*n+1)!/(60*prime(2*n-1)!).
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1
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1, 5544, 148512, 1211364, 5301223200, 67804092195840, 128850876, 8937268342895692800, 4383026968320, 2042765424, 147107459292393600, 40633707301699873935974400, 17158084020, 24300280368
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OFFSET
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1,2
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COMMENTS
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Oscillating sequence
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LINKS
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Harvey P. Dale, Table of n, a(n) for n = 1..1000
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EXAMPLE
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a(3)=prime(7)!/prime(5)!/60=355687428096000/39916800/60=148512
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MATHEMATICA
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#[[2]]/(60*#[[1]])&/@Partition[Prime[Range[1, 31, 2]]!, 2, 1] (* Harvey P. Dale, Mar 05 2017 *)
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PROG
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(PARI) a(n)=prime(2*n+1)!/prime(2*n-1)!/60
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CROSSREFS
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Cf. A178614
Sequence in context: A278012 A255100 A031795 * A203336 A045104 A043512
Adjacent sequences: A180264 A180265 A180266 * A180268 A180269 A180270
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KEYWORD
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easy,nonn
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AUTHOR
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Graziano Aglietti (mg5055(AT)mclink.it), Aug 23 2010
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STATUS
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approved
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