A070990 - OEIS

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A070990

First differences of A002487.

1, -1, 2, -1, 1, -2, 3, -1, 2, -3, 3, -2, 1, -3, 4, -1, 3, -4, 5, -3, 2, -5, 5, -2, 3, -5, 4, -3, 1, -4, 5, -1, 4, -5, 7, -4, 3, -7, 8, -3, 5, -8, 7, -5, 2, -7, 7, -2, 5, -7, 8, -5, 3, -8, 7, -3, 4, -7, 5, -4, 1, -5, 6, -1, 5, -6, 9, -5, 4, -9, 11, -4, 7, -11, 10, -7, 3, -10, 11, -3, 8, -11, 13, -8, 5, -13, 12, -5, 7, -12, 9, -7, 2, -9, 9, -2, 7, -9, 12, -7 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	FORMULA	`-a(2n+3) = a(2n) = A002487(n+2), n >= 0. - Ralf Stephan (ralf(AT)ark.in-berlin.de), Aug 17 2003`
	CROSSREFS	`Sequence in context: A112757 A118492 A079246 * A097868 A025830 A083796` `Adjacent sequences: A070987 A070988 A070989 * A070991 A070992 A070993`
	KEYWORD	`sign`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), May 24 2002`

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Last modified February 14 11:36 EST 2012. Contains 205623 sequences.