|
Search: id:A117179
|
|
|
| A117179 |
|
Riordan array ((1-x^2)/(1+x^2)^2,x/(1+x^2)). |
|
+0
2
|
|
| 1, 0, 1, -3, 0, 1, 0, -4, 0, 1, 5, 0, -5, 0, 1, 0, 9, 0, -6, 0, 1, -7, 0, 14, 0, -7, 0, 1, 0, -16, 0, 20, 0, -8, 0, 1, 9, 0, -30, 0, 27, 0, -9, 0, 1, 0, 25, 0, -50, 0, 35, 0, -10, 0, 1, -11, 0, 55, 0, -77, 0, 44, 0, -11, 0, 1
(list; table; graph; listen)
|
|
|
OFFSET
|
0,4
|
|
|
COMMENT
|
Inverse is A117178. Row sums are (-1)^n*A098554(n+1). Diagonal sums are 1,0,-2,0,2,0,-2,... with g.f. (1-x^2)/(1+x^2).
|
|
EXAMPLE
|
Triangle begins
1,
0, 1,
-3, 0, 1,
0, -4, 0, 1,
5, 0, -5, 0, 1,
0, 9, 0, -6, 0, 1,
-7, 0, 14, 0, -7, 0, 1,
0, -16, 0, 20, 0, -8, 0, 1
|
|
CROSSREFS
|
Sequence in context: A123878 A108197 A049769 this_sequence A111526 A117178 A111527
Adjacent sequences: A117176 A117177 A117178 this_sequence A117180 A117181 A117182
|
|
KEYWORD
|
easy,sign,tabl
|
|
AUTHOR
|
Paul Barry (pbarry(AT)wit.ie), Mar 01 2006
|
|
|
Search completed in 0.002 seconds
|
