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A127805 Inverse of number triangle A(n,k) = 1/((10*10^n-1)/9) if k <= n <= 2k, 0 otherwise. 1
1, 0, 11, 0, -11, 111, 0, 11, -111, 1111, 0, 0, 0, -1111, 11111, 0, -11, 111, 0, -11111, 111111, 0, 0, 0, 0, 0, -111111, 1111111, 0, 11, -111, 1111, 0, 0, -1111111, 11111111, 0, 0, 0, 0, 0, 0, 0, -11111111, 111111111 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Row sums are A127806.

LINKS

Table of n, a(n) for n=0..44.

EXAMPLE

Triangle begins

  1;

  0, 11;

  0, -11, 111;

  0, 11, -111, 1111;

  0, 0, 0, -1111, 11111;

  0, -11, 111, 0, -11111, 111111;

  0, 0, 0, 0, 0, -111111, 1111111;

  0, 11, -111, 1111, 0, 0, -1111111, 11111111;

  0, 0, 0, 0, 0, 0, 0, -11111111, 111111111;

  0, 0, 0, -1111, 11111, 0, 0, 0, -111111111, 1111111111;

  0, 0, 0, 0, 0, 0, 0, 0, 0, -1111111111, 11111111111;

Triangle is inverse of

  1;

  0, 1/11;

  0, 1/111, 1/111;

  0, 0, 1/1111, 1/1111;

  0, 0, 1/11111, 1/11111, 1/11111;

  0, 0, 0, 1/111111, 1/111111, 1/111111;

  0, 0, 0, 1/1111111, 1/1111111, 1/1111111, 1/1111111;

  0, 0, 0, 0, 1/11111111, 1/11111111, 1/11111111, 1/11111111;

  0, 0, 0, 0, 1/111111111, 1/111111111, 1/111111111, 1/111111111, 1/111111111;

CROSSREFS

Sequence in context: A187553 A003621 A055963 * A256480 A088621 A088623

Adjacent sequences:  A127802 A127803 A127804 * A127806 A127807 A127808

KEYWORD

sign,tabl

AUTHOR

Paul Barry, Jan 29 2007

STATUS

approved

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Last modified October 18 05:07 EDT 2019. Contains 328145 sequences. (Running on oeis4.)