|
| |
|
|
A138187
|
|
Hankel transform of C(2n+3,n).
|
|
1
| |
|
|
1, -4, 3, 3, -8, 5, 5, -12, 7, 7, -16, 9, 9, -20, 11, 11, -24, 13, 13, -28, 15, 15, -32, 17, 17, -36, 19, 19, -40, 21, 21, -44, 23, 23, -48, 25, 25, -52, 27, 27, -56, 29, 29, -60, 31, 31, -64, 33, 33, -68, 35, 35, -72, 37, 37, -76, 39, 39, -80, 41
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,2
|
|
|
COMMENTS
| Hankel transform of A002054(n+1). Hankel transform of A002054(n) is A057078(n+1).
Partial sums are A138188.
The sequence 1,1,-4,3,3,... has general term sum{k=0..n, C(n+k,2k)*(-1)^(n-k)*(n+k+1)}. [From Paul Barry (pbarry(AT)wit.ie), Apr 19 2010]
|
|
|
FORMULA
| G.f. : (1-2x-2x^2-x^3)/(1+x+x^2)^2;
|
|
|
CROSSREFS
| Sequence in context: A006994 A038627 A155835 * A055525 A007568 A091884
Adjacent sequences: A138184 A138185 A138186 * A138188 A138189 A138190
|
|
|
KEYWORD
| easy,sign
|
|
|
AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Mar 04 2008
|
| |
|
|
