|
|
A248592
|
|
Denominators of the (simplified) rational numbers n*2^(n - 1)/(n - 1)! .
|
|
4
|
|
|
1, 1, 1, 3, 3, 5, 45, 315, 35, 567, 14175, 51975, 467775, 868725, 2837835, 638512875, 638512875, 1206079875, 97692469875, 371231385525, 441942125625, 17717861581875, 2143861251406875, 16436269594119375, 5917057053882975, 284473896821296875, 1780595872696265625
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,4
|
|
LINKS
|
|
|
FORMULA
|
a(n) = denom(n * 2^(n - 1) / (n - 1)!).
a(n) = denom(g(1, n)) where g(m, n) = m if m = n; 2g(m + 1, n)/m otherwise.
|
|
MAPLE
|
n*2^(n-1)/(n-1)! ;
denom(%) ;
end proc:
|
|
PROG
|
(PARI) vector(40, n, denominator(n*2^(n - 1)/(n - 1)!)) \\ Michel Marcus, Oct 09 2014
|
|
CROSSREFS
|
Has same start as A241591 but is a different sequence.
|
|
KEYWORD
|
frac,nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|