A127753 - OEIS

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A127753

Inverse of number triangle A(n,k)=if(k<=n,if(n<=2k,1/L(n+1),0),0), L(n)=A000032(n).

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 (list; table; graph; refs; listen; history; internal format)

	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` `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: A167223 A078907 A111815 * A197736 A073367 A111862` `Adjacent sequences: A127750 A127751 A127752 * A127754 A127755 A127756`
	KEYWORD	`sign,tabl`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 28 2007`

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Last modified February 14 18:47 EST 2012. Contains 205663 sequences.