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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: A003621 A338827 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 April 12 01:36 EDT 2021. Contains 342912 sequences. (Running on oeis4.)