|
| |
|
|
A110164
|
|
Expansion of (1-x^2)/(1+2x).
|
|
5
| |
|
|
1, -2, 3, -6, 12, -24, 48, -96, 192, -384, 768, -1536, 3072, -6144, 12288, -24576, 49152, -98304, 196608, -393216, 786432, -1572864, 3145728, -6291456, 12582912, -25165824, 50331648, -100663296, 201326592, -402653184, 805306368, -1610612736, 3221225472
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,2
|
|
|
COMMENTS
| Diagonal sums of Riordan array ((1-x)/(1+x),x/(1+x)^2), A110162.
The positive sequence with g.f. (1-x^2)/(1-2x) gives the row sums of the Riordan array (1+x,x/(1-x)). - Paul Barry (pbarry(AT)wit.ie), Jul 18 2005
The inverse g.f. is (1 + 2*x + x^2 + 2*x^3 + x^4 + 2*x^5 + x^6 + ...) - From Gary W. Adamson, Jan 07 2011
|
|
|
MATHEMATICA
| CoefficientList[Series[(1 - x^2)/(1 + 2x), {x, 0, 33}], x] (* from Robert G. Wilson v, Jul 08 2006 *)
|
|
|
CROSSREFS
| Cf. A098011.
Sequence in context: A049890 A042950 A098011 * A035055 A119559 A045761
Adjacent sequences: A110161 A110162 A110163 * A110165 A110166 A110167
|
|
|
KEYWORD
| easy,sign,changed
|
|
|
AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Jul 14 2005
|
| |
|
|
