id:A047073 - OEIS Search Results

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Sum{T(i,n-i): i=0,1,...,n}, array T as in A047072.

+0
3

1, 2, 4, 4, 8, 12, 24, 40, 80, 140, 280, 504, 1008, 1848, 3696, 6864, 13728, 25740, 51480, 97240, 194480, 369512, 739024, 1410864, 2821728, 5408312, 10816624, 20801200, 41602400, 80233200, 160466400, 310235040, 620470080, 1202160780 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: 1+sqrt((1+2x)/(1-2x))2x. - Michael Somos`
	PROGRAM	`(PARI) a(n)=if(n<2, max(0, n+1), 4*binomial(n-2, n\2-1))`
	CROSSREFS	`2*A063886(n)=a(n+1).` `Sequence in context: A076342 A135268 A131771 this_sequence A069753 A089887 A161816` `Adjacent sequences: A047070 A047071 A047072 this_sequence A047074 A047075 A047076`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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