A117910 - OEIS

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A117910

Expansion of (1+x+x^2+x^4)/((1-x^3)(1-x^6)).

1, 1, 1, 1, 2, 1, 2, 3, 2, 2, 4, 2, 3, 5, 3, 3, 6, 3, 4, 7, 4, 4, 8, 4, 5, 9, 5, 5, 10, 5, 6, 11, 6, 6, 12, 6, 7, 13, 7, 7, 14, 7, 8, 15, 8, 8, 16, 8, 9, 17, 9, 9, 18, 9, 10, 19, 10, 10, 20, 10, 11, 21, 11, 11, 22, 11, 12, 23, 12, 12, 24, 12, 13, 25, 13, 13, 26, 13, 14, 27, 14 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	COMMENTS	`Diagonal sums of A117908. Appears to be a permutation of floor((n+5)/5).`
	FORMULA	`a(n)=a(n-3)+a(n-6)-a(n-9); a(n)=sum{k=0..floor(n/2),0^abs(L(C(n-k,2)/3)-2*L(C(k,2)/3))} where L(j/p) is the Legendre symbol of j and p.`
	CROSSREFS	`Sequence in context: A058071 A174961 A104889 * A029267 A111725 A112218` `Adjacent sequences: A117907 A117908 A117909 * A117911 A117912 A117913`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Apr 01 2006`

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Last modified February 15 21:00 EST 2012. Contains 205852 sequences.