id:A124370 - OEIS Search Results

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Expansion of 1/(1-2x^2-3x^3-x^4).

+0
2

1, 0, 2, 3, 5, 12, 21, 42, 83, 159, 313, 609, 1186, 2316, 4512, 8799, 17158, 33450, 65225, 127173, 247958, 483471, 942660, 1837989, 3583691, 6987429, 13624009, 26563920, 51793996, 100987296, 196903761, 383920500 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Diagonal sums of number triangle A124369.`
	FORMULA	`a(n)=sum{k=0..floor(n/2), sum{j=0..n-k, C(j,n-k-j)C((j+k)/2,(j-k)/2)(1+(-1)^(j-k))/2}}`
	CROSSREFS	`Sequence in context: A064688 A089891 A004689 this_sequence A003428 A030041 A008323` `Adjacent sequences: A124367 A124368 A124369 this_sequence A124371 A124372 A124373`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Oct 27 2006`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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