id:A114196 - OEIS Search Results

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Expansion of (1-3x)/(1-6x+8x^2+x^3).

+0
2

1, 3, 10, 35, 127, 472, 1781, 6783, 25978, 99823, 384331, 1481424, 5714073, 22048715, 85098282, 328485899, 1268080423, 4895497064, 18899853101, 72967061671, 281708048154, 1087611942455, 4199040207827, 16211637659168 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Diagonal sums of A114195.`
	FORMULA	`a(n)=6a(n-1)-8a(n-2)-a(n-3); a(n)=sum{k=0..floor(n/2), sum{j=0..n-k, C(n-k, j)C(j+k, 2k)2^(j-k)}}.`
	CROSSREFS	`Sequence in context: A072266 A085282 A047127 this_sequence A078789 A128736 A084781` `Adjacent sequences: A114193 A114194 A114195 this_sequence A114197 A114198 A114199`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Nov 16 2005`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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