A106193 - OEIS

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A106193

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

1, -2, 0, -8, -10, -44, -104, -352, -1066, -3564, -11856, -40720, -141284, -497464, -1768368, -6343808, -22926426, -83402956, -305142432, -1122083312, -4144811244, -15372407464, -57222156528, -213709942208, -800563540356, -3007228179064, -11325019883616 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,2`
	LINKS	`Table of n, a(n) for n=0..26.`
	FORMULA	`a(n)=sum{k=0..floor(n/2), binomial(2(n-2k), n-2k)/(1-2(n-2k))*2^k}.`
	CROSSREFS	`Cf. A106192.` `Sequence in context: A181592 A097348 A185965 * A085814 A009524 A009794` `Adjacent sequences: A106190 A106191 A106192 * A106194 A106195 A106196`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry, Apr 24 2005`
	STATUS	`approved`

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Last modified June 19 16:47 EDT 2013. Contains 226415 sequences.