id:A104565 - OEIS Search Results

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Reversion of Pell numbers A000129(n+1).

+0
2

1, -2, 3, -2, -6, 28, -61, 54, 158, -860, 2062, -2004, -5804, 33720, -84509, 86054, 247862, -1492908, 3838298, -4019452, -11537556, 71101832, -185868978, 198310460, 567902572, -3555617432, 9404104764, -10168382696, -29069700056, 184127171952, -491229517661 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: (sqrt(1+4x+8x^2)-1-2x)/(2x^2).` `a(n)=sum{k=0..floor(n/2), binomial(n, 2k)C(k)(-1)^(n-k)2^(n-2k)}, where C(n) is A000108. - Paul Barry (pbarry(AT)wit.ie), May 16 2005`
	CROSSREFS	`Sequence in context: A059446 A143806 A109878 this_sequence A144456 A051886 A118007` `Adjacent sequences: A104562 A104563 A104564 this_sequence A104566 A104567 A104568`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 15 2005`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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