id:A154604 - OEIS Search Results

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Hankel transform of reduced tangent numbers.

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1, 1, 3, 54, 9720, 26244000, 1488034800000, 2362404048480000000, 135019896025206528000000000, 347259290825980971841536000000000000, 49121618545275670528799969525760000000000000000 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Hankel transform of A002105 (with interpolated zeros). Hankel transform of A154603.`
	FORMULA	`a(n)=product{k=1..n, C(k+1,2)^(n-k+1)}.`
	CROSSREFS	`Sequence in context: A171739 A157568 A156911 this_sequence A088278 A041155 A111483` `Adjacent sequences: A154601 A154602 A154603 this_sequence A154605 A154606 A154607`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 12 2009`

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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.

AT&T Labs Research