id:A106192 - OEIS Search Results

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Expansion of sqrt(1-4x)/(1-x^2).

+0
3

1, -2, -1, -6, -11, -34, -95, -298, -953, -3158, -10677, -36750, -128249, -452774, -1614049, -5801654, -21003739, -76516994, -280293319, -1031794394, -3814819699, -14160035234, -52747353739, -197125162514, -738866581039, -2776933457162, -10462759383943 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Diagonal sums of number triangle A106190.`
	FORMULA	`a(n)=sum{k=0..floor(n/2), binomial(2(n-2k), n-2k)/(1-2(n-2k))}.`
	CROSSREFS	`Sequence in context: A039762 A039795 A049949 this_sequence A113025 A113216 A081064` `Adjacent sequences: A106189 A106190 A106191 this_sequence A106193 A106194 A106195`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Apr 24 2005`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research