A117568 Riordan array ((1-x^3)/(1+x^2),x).

1, 0, 1, -1, 0, 1, -1, -1, 0, 1, 1, -1, -1, 0, 1, 1, 1, -1, -1, 0, 1, -1, 1, 1, -1, -1, 0, 1, -1, -1, 1, 1, -1, -1, 0, 1, 1, -1, -1, 1, 1, -1, -1, 0, 1, 1, 1, -1, -1, 1, 1, -1, -1, 0, 1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 0, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 0, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 0, 1

Offset

0,1

Comments

Inverse of number triangle A117567. Row sums are A117569. Diagonal sums are A102560.

Links

Table of n, a(n) for n=0..90.

Example

Triangle begins
1,
0, 1,
-1, 0, 1,
-1, -1, 0, 1,
1, -1, -1, 0, 1,
1, 1, -1, -1, 0, 1,
-1, 1, 1, -1, -1, 0, 1,
-1, -1, 1, 1, -1, -1, 0, 1,
1, -1, -1, 1, 1, -1, -1, 0, 1

Crossrefs

Sequence in context: A117567 A307183 A361433 * A093521 A187948 A188433

Adjacent sequences: A117565 A117566 A117567 * A117569 A117570 A117571

Keyword

easy,sign,tabl

Author

Paul Barry, Mar 29 2006

Status

approved