login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A238685 n! * A129505(n) * (-1)^(n+1). 3

%I

%S 1,-6,210,-17640,2693880,-649479600,226750764240,-108116216208000,

%T 67478689070432640,-53382381970299782400,52192613508738839136000,

%U -61794396463636399635072000,87121906773549083421777792000,-144222462676882552982237906688000

%N n! * A129505(n) * (-1)^(n+1).

%C a(n) = A048594(2*n-1,n).

%H Reinhard Zumkeller, <a href="/A238685/b238685.txt">Table of n, a(n) for n = 1..200</a>

%F a(n) = A000142(n) * A008275(2*n-1,n).

%o (Haskell)

%o a238685 n = a000142 n * a008275 (2 * n - 1) n

%K sign

%O 1,2

%A _Reinhard Zumkeller_, Mar 02 2014

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 18 07:11 EDT 2021. Contains 343072 sequences. (Running on oeis4.)