id:A070808 - OEIS Search Results

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Sum(((-1)^k*binomial(4*n,k)),k=n..2*n).

+0
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1, 2, 42, 407, 6890, 88502, 1385727, 19762290, 303169770, 4514031830, 69135179542, 1050132147077, 16141218975167, 247800513084152, 3825796483371170, 59118992260132532, 916434202205565162 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`1/2(-1)^(2n)binomial(4n, 2n)+1/4(-1)^nbinomial(4n, n)`
	CROSSREFS	`Sequence in context: A076392 A048373 A066563 this_sequence A157056 A140170 A038396` `Adjacent sequences: A070805 A070806 A070807 this_sequence A070809 A070810 A070811`
	KEYWORD	`easy,nonn`
	AUTHOR	`Sebastian Gutierrez and Sarah Kolitz (skolitz(AT)mit.edu), May 15 2002`

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

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