login
A128779
a(n) = denominator of Product_{k=1..n} (1 + {n/k}), where {x} is the fractional part of x, {x} = x - floor(x).
1
1, 1, 2, 3, 8, 5, 60, 63, 896, 189, 5760, 275, 142560, 6435, 256256, 4729725, 40255488, 270725, 916531200, 34613649, 1323008000, 618100875, 412580044800, 1101163525, 13664651083776, 236102414625, 51192627200000, 21986435059875
OFFSET
1,3
MAPLE
a:=n->denom(product(1+frac(n/k), k=1..n)): seq(a(n), n=1..32); # Emeric Deutsch, Mar 30 2007
CROSSREFS
Cf. A128778.
Sequence in context: A162537 A369740 A109844 * A112283 A136182 A170911
KEYWORD
frac,nonn
AUTHOR
Leroy Quet, Mar 27 2007
EXTENSIONS
More terms from Emeric Deutsch, Mar 30 2007
STATUS
approved