|
Search: id:A115359
|
|
|
| A115359 |
|
Matrix (1,x)-(x,x^2) in Riordan array notation. |
|
+0
4
|
|
| 1, -1, 1, 0, 0, 1, 0, -1, 0, 1, 0, 0, 0, 0, 1, 0, 0, -1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, -1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, -1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0
(list; table; graph; listen)
|
|
|
OFFSET
|
0,1
|
|
|
COMMENT
|
Row sums are 1,0,1,0,1,0... Diagonal sums are A115360. Inverse is A115361.
|
|
FORMULA
|
Number triangle T(n, k)=if(n=k, 1, 0) OR if(n=2k+1, -1, 0).
|
|
EXAMPLE
|
Triangle begins
1;
-1, 1;
0, 0, 1;
0, -1, 0, 1;
0, 0, 0, 0, 1;
0, 0, -1, 0, 0, 1;
0, 0, 0, 0, 0, 0, 1;
0, 0, 0, -1, 0, 0, 0, 1;
0, 0, 0, 0, 0, 0, 0, 0, 1;
0, 0, 0, 0, -1, 0, 0, 0, 0, 1;
|
|
CROSSREFS
|
Sequence in context: A143062 A074910 A115356 this_sequence A117906 A090678 A110037
Adjacent sequences: A115356 A115357 A115358 this_sequence A115360 A115361 A115362
|
|
KEYWORD
|
easy,sign,tabl
|
|
AUTHOR
|
Paul Barry (pbarry(AT)wit.ie), Jan 21 2006
|
|
|
Search completed in 0.002 seconds
|
