login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A069990 (-1)^(n+1)/5*sum(k=1,2n,C(2n+1,k)*B(k)*5^k) where C(n,k) are the binomial coefficients, B(k) the Bernoulli numbers. 0
1, 15, 389, 17687, 1230957, 121576879, 16166877205, 2784640846791, 603078760252733, 160399574539581023, 51396542533525536741, 19528343388372578867575, 8681260357657270101974029 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..13.

PROG

(PARI) for(n=1, 25, print1(-(-1)^n*sum(i=1, 2*n, binomial(2*n+1, i)*bernfrac(i)*5^i)/5, ", "))

CROSSREFS

Sequence in context: A164323 A129615 A286139 * A157581 A143001 A250950

Adjacent sequences:  A069987 A069988 A069989 * A069991 A069992 A069993

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, May 01 2002

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified September 24 18:54 EDT 2017. Contains 292433 sequences.