id:A127847 - OEIS Search Results

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a(n)=4^C(n,2)*(4^n-1)/3.

+0
2

0, 1, 20, 1344, 348160, 357564416, 1465657589760, 24017731997138944, 1574098141758535761920, 412645105639632468417970176, 432690992231222540584116394393600 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`-a(n) is the Hankel transform of A127846, the series reversion of x/(1+5x+4x^2). Note that (4^n-1)/3 has g.f. x/(1-5x+4x^2).`
	CROSSREFS	`Adjacent sequences: A127844 A127845 A127846 this_sequence A127848 A127849 A127850` `Sequence in context: A001451 A093598 A005982 this_sequence A130040 A094035 A014606`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 02 2007`

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Last modified October 6 12:54 EDT 2008. Contains 144667 sequences.

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