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A106470 Inverse of number triangle A106468. 0
1, -1, 1, -1, 0, 1, 1, -1, -1, 1, 1, 0, -1, 0, 1, -1, 1, 1, -1, -1, 1, -1, 0, 1, 0, -1, 0, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, 0, -1, 0, 1, 0, -1, 0, 1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 0, 1, 0, -1, 0, 1, 0, -1, 0, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, 0, -1, 0, 1, 0, -1, 0, 1, 0, -1, 0, 1, -1, 1, 1, -1, -1, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

A 'mixed' sequence array : rows alternate between the rows of the sequence array for the sequence 1,-1,-1,1,1,-1,-1,.. with g.f. (1-x)/(1+x^2) and the sequence array for the sequence 1,0,-1,0,-1,... with g.f. 1/(1+x^2). Column 2k has g.f. x^2k(1-x)/(1+x^2) column 2k+1 has g.f. x^(2k+1)/(1+x^2). Row sums are 1,0,0,0,1,0,0,0,1,.. with g.f. 1/(1-x^4).

LINKS

Table of n, a(n) for n=0..97.

FORMULA

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

CROSSREFS

Sequence in context: A323378 A054431 A164381 * A106465 A071027 A337264

Adjacent sequences: A106467 A106468 A106469 * A106471 A106472 A106473

KEYWORD

sign,tabl

AUTHOR

Paul Barry, May 03 2005

STATUS

approved

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Last modified December 2 20:59 EST 2022. Contains 358510 sequences. (Running on oeis4.)