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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
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: A348006 A338827 A055963 * A256480 A088621 A088623
KEYWORD
sign,tabl
AUTHOR
Paul Barry, Jan 29 2007
STATUS
approved

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Last modified July 14 13:08 EDT 2024. Contains 374318 sequences. (Running on oeis4.)