|
|
A279331
|
|
Denominators of coefficients in expansion of (cos(sqrt x))/(1 - x - x^2).
|
|
2
|
|
|
1, 2, 24, 720, 8064, 3628800, 479001600, 87178291200, 20922789888000, 98498057011200, 187146308321280000, 66117689869271040000, 36496964807837614080000, 403291461126605635584000000, 60977668922342772100300800000, 13960676832220582033489920000000
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
LINKS
|
|
|
EXAMPLE
|
(1/1) + (1/2)*x + (37/24)*x^2 + (1469/720)*x^3 + ... , therefore: 1/1, 1/2, 37/24, 1469/720, ... = A279330/A279331.
|
|
MATHEMATICA
|
z = 30; t = CoefficientList[Series[Cos[Sqrt[x]]/(1 - x - x^2), {x, 0, z}], x];
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,frac,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|