id:A098460 - OEIS Search Results

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E.g.f.: 1/sqrt(1-2x-2x^2).

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1, 1, 5, 33, 321, 3945, 59445, 1056825, 21677985, 503799345, 13084021125, 375524312625, 11803392302625, 403235809601625, 14876913457531125, 589498927632239625, 24969077812488434625, 1125803018759825030625 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n)=(n!/2^n)*A084609(n); a(n)=(n!/2^n)sum{k=0..floor(n/2), Binomial(n, k)Binomial(2(n-k), n)2^k}; a(n)=n!sum{k=0..floor(n/2), Binomial(n, k)Binomial(2(n-k), n)2^(k-n)}.`
	CROSSREFS	`Cf. A012244.` `Sequence in context: A144792 A001828 A084845 this_sequence A087618 A134152 A140424` `Adjacent sequences: A098457 A098458 A098459 this_sequence A098461 A098462 A098463`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 08 2004`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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