A129110 - OEIS

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A129110

A transformation of the Catalan sequence.

1, 2, 1, -1, 1, 6, 1, -13, 1, 43, 1, -131, 1, 430, 1, -1429, 1, 4863, 1, -16795, 1, 58787, 1, -208011, 1, 742901, 1, -2674439, 1, 9694846, 1, -35357669, 1, 129644791, 1, -477638699, 1, 1767263191, 1, -6564120419, 1, 24466267021, 1, -91482563639, 1, 343059613651 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`a(2n)=1. a(2n+1)= 1+(-1)^n*C(n+1), where C=A000108.` `a(n+1)-a(n) = A129996(n) (similar to A099363 and A106181).`
	CROSSREFS	`Sequence in context: A156186 A156233 A060185 * A112624 A139329 A069777` `Adjacent sequences: A129107 A129108 A129109 * A129111 A129112 A129113`
	KEYWORD	`sign`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), May 24 2007`
	EXTENSIONS	`Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 04 2008`

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Last modified February 16 13:30 EST 2012. Contains 205909 sequences.