|
|
A248591
|
|
Numerators of the (simplified) rationals n*2^(n - 1)/(n - 1)! .
|
|
2
|
|
|
1, 4, 6, 16, 10, 8, 28, 64, 2, 8, 44, 32, 52, 16, 8, 256, 34, 8, 76, 32, 4, 16, 184, 128, 4, 16, 8, 64, 232, 32, 496, 1024, 2, 8, 4, 32, 148, 16, 8, 128, 164, 16, 344, 64, 8, 32, 752, 512, 4, 16, 8, 64, 424, 32, 16, 256, 8, 32, 944, 128, 976, 64, 32, 4096, 2
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
LINKS
|
|
|
FORMULA
|
a(n) = numerator(n*2^(n - 1)/(n - 1)!).
a(n) = numerator(g(1, n)) where g(m, n) = m if m = n; 2*g(m + 1, n)/m otherwise.
|
|
MATHEMATICA
|
|
|
PROG
|
(PARI) vector(100, n, numerator(n*2^(n - 1)/(n - 1)!)) \\ Michel Marcus, Oct 09 2014
(Magma) [Numerator(n*2^(n-1)/Factorial(n-1)): n in [1..70]]; // Vincenzo Librandi, Oct 16 2014
|
|
CROSSREFS
|
|
|
KEYWORD
|
frac,nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|