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A117568 Riordan array ((1-x^3)/(1+x^2),x). 2
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 (list; table; graph; refs; listen; history; text; internal format)
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: A088150 A117567 A307183 * A093521 A187948 A188433

Adjacent sequences:  A117565 A117566 A117567 * A117569 A117570 A117571

KEYWORD

easy,sign,tabl

AUTHOR

Paul Barry, Mar 29 2006

STATUS

approved

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Last modified January 26 20:33 EST 2020. Contains 331288 sequences. (Running on oeis4.)