id:A138569 - OEIS Search Results

Search: id:A138569

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First differences of A137776.

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0, 1, 0, 1, 0, 1, 1, 0, 4, -2, 10, -4, 20, -4, 36, 0, 64, 8, 120, 16, 240, 16, 496, 0, 1024, -32, 2080, -64, 4160, -64, 8256, 0, 16384, 128, 32640, 256, 65280, 256, 130816, 0, 262144, -512, 524800, -1024, 1049600, -1024, 2098176, 0, 4194304, 2048, 8386560, 4096, 16773120 (list; graph; listen)

	OFFSET	`0,9`
	FORMULA	`a(n)=4a(n-2)-6a(n-4)+4a(n-6), n>7.` `a(2n)=A000749(n). a(2n+1)=(-1)^(n+1)*A009116(n-1), n>0.` `O.g.f.: x(1-x)(x^4-2x^2+1+x-2x^3+2x^5)/((1-2x^2)(1-2x^2+2x^4)). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 02 2008`
	CROSSREFS	`Cf. A135356.` `Sequence in context: A052915 A130273 A016516 this_sequence A160572 A066579 A117821` `Adjacent sequences: A138566 A138567 A138568 this_sequence A138570 A138571 A138572`
	KEYWORD	`sign`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), May 12 2008`
	EXTENSIONS	`Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 02 2008`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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