A180267 Prime(2*n+1)!/(60*prime(2*n-1)!).

1, 5544, 148512, 1211364, 5301223200, 67804092195840, 128850876, 8937268342895692800, 4383026968320, 2042765424, 147107459292393600, 40633707301699873935974400, 17158084020, 24300280368

Offset

1,2

Comments

Oscillating sequence

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

a(3)=prime(7)!/prime(5)!/60=355687428096000/39916800/60=148512

Mathematica

#[[2]]/(60*#[[1]])&/@Partition[Prime[Range[1, 31, 2]]!, 2, 1] (* Harvey P. Dale, Mar 05 2017 *)

Prog

(PARI) a(n)=prime(2*n+1)!/prime(2*n-1)!/60

Crossrefs

Cf. A178614

Sequence in context: A278012 A255100 A031795 * A203336 A045104 A043512

Adjacent sequences: A180264 A180265 A180266 * A180268 A180269 A180270

Keyword

easy,nonn

Author

Graziano Aglietti (mg5055(AT)mclink.it), Aug 23 2010

Status

approved