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A117200 Inverse of number triangle (1,x)+(x,x^2)+(x^2,x^3). 2
1, -1, 1, -1, 0, 1, 1, -1, 0, 1, 0, 0, 0, 0, 1, 2, -1, -1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, -1, 1, 0, -1, 0, 0, 0, 1, 1, 0, -1, 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, -3, 2, 1, -1, 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, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,16

COMMENTS

Inverse of A117198. Row sums are A117201.

LINKS

Table of n, a(n) for n=0..120.

EXAMPLE

Triangle begins

1,

-1, 1,

-1, 0, 1,

1, -1, 0, 1,

0, 0, 0, 0, 1,

2, -1, -1, 0, 0, 1,

0, 0, 0, 0, 0, 0, 1,

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

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

CROSSREFS

Sequence in context: A204431 A143809 A056559 * A107015 A015374 A164058

Adjacent sequences:  A117197 A117198 A117199 * A117201 A117202 A117203

KEYWORD

sign,tabl

AUTHOR

Paul Barry, Mar 02 2006

STATUS

approved

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Last modified October 14 02:19 EDT 2019. Contains 327994 sequences. (Running on oeis4.)