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A127753
Inverse of number triangle A(n,k) = 1/L(n+1) if k <= n <= 2k, 0 otherwise, where L(n) = A000032(n).
1
1, 0, 3, 0, -3, 4, 0, 3, -4, 7, 0, 0, 0, -7, 11, 0, -3, 4, 0, -11, 18, 0, 0, 0, 0, 0, -18, 29, 0, 3, -4, 7, 0, 0, -29, 47, 0, 0, 0, 0, 0, 0, 0, -47, 76, 0, 0, 0, -7, 11, 0, 0, 0, -76, 123, 0, 0, 0, 0, 0, 0, 0, 0, 0, -123, 199, 0, -3, 4, 0, -11, 18, 0, 0
OFFSET
0,3
COMMENTS
Row sums are A127754.
EXAMPLE
Triangle begins
1;
0, 3;
0, -3, 4;
0, 3, -4, 7;
0, 0, 0, -7, 11;
0, -3, 4, 0, -11, 18;
0, 0, 0, 0, 0, -18, 29;
0, 3, -4, 7, 0, 0, -29, 47;
0, 0, 0, 0, 0, 0, 0, -47, 76;
0, 0, 0, -7, 11, 0, 0, 0, -76, 123;
0, 0, 0, 0, 0, 0, 0, 0, 0, -123, 199;
0, -3, 4, 0, -11, 18, 0, 0, 0, 0, -199, 322;
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -322, 521;
Inverse of triangle begins
1;
0, 1/3;
0, 1/4, 1/4;
0, 0, 1/7, 1/7;
0, 0, 1/11, 1/11, 1/11;
0, 0, 0, 1/18, 1/18, 1/18;
0, 0, 0, 1/29, 1/29, 1/29, 1/29;
0, 0, 0, 0, 1/47, 1/47, 1/47, 1/47;
0, 0, 0, 0, 1/76, 1/76, 1/76, 1/76, 1/76;
0, 0, 0, 0, 0, 1/123, 1/123, 1/123, 1/123, 1/123;
0, 0, 0, 0, 0, 1/199, 1/199, 1/199, 1/199, 1/199, 1/199;
CROSSREFS
Cf. A127711.
Sequence in context: A111815 A281269 A210877 * A197736 A073367 A222769
KEYWORD
sign,tabl
AUTHOR
Paul Barry, Jan 28 2007
STATUS
approved