|
|
A220852
|
|
Numerators of the fraction (30*n+7) * binomial(2*n,n)^2 * 2F1([1/2 - n/2, -n/2], [1], 64)/(-256)^n, where 2F1 is the hypergeometric function.
|
|
2
|
|
|
7, -37, 19899, -235225, 268989175, -4985687133, 1052143756587, -25075299330081, 71491170131441775, -1979286926244381325, 319756423353994489291, -9700423363591011143001, 5919065321069316557189503, -189993537046726536185033125
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,1
|
|
COMMENTS
|
The Gaussian hypergeometric function 2F1() is a polynomial in n because at least one of the "numerators" is a negative integer. 2F1( [(1-n)/2,-n/2], [1], 64) = A098441(n). - R. J. Mathar, Jan 09 2013
|
|
LINKS
|
|
|
FORMULA
|
Sum_{n>=0} a(n)/A220853(n) = 24/Pi.
More directly, Sum_{k>=0} (30*k+7) * binomial(2k,k)^2 * (Hypergeometric2F1[1/2 - k/2, -k/2, 1,64])/(-256)^k = 24/Pi.
Another version of this identity is Sum_{k>=0} (30*k+7) * binomial(2k,k)^2 * (Sum_{m=0..k/2} binomial(k-m,m) * binomial(k,m) * 16^m)/(-256)^k.
|
|
MAPLE
|
hypergeom([1/2-n/2, -n/2], [1], 64) ;
simplify(%) ;
(30*n+7)*binomial(2*n, n)^2*%/(-256)^n ;
numer(%) ;
|
|
MATHEMATICA
|
Numerator[Table[(30*n + 7)*Binomial[2*n, n]^2* Hypergeometric2F1[(1 - n)/2, -n/2, 1, 64]/(-256)^n, {n, 0, 50}]] (* G. C. Greubel, Feb 20 2017 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
sign,frac
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|