id:A102899 - OEIS Search Results

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Ceiling(n/3)^2-floor(n/3)^2.

+0
2

0, 1, 1, 0, 3, 3, 0, 5, 5, 0, 7, 7, 0, 9, 9, 0, 11, 11, 0, 13, 13, 0, 15, 15, 0, 17, 17, 0, 19, 19, 0, 21, 21, 0, 23, 23, 0, 25, 25, 0, 27, 27, 0, 29, 29, 0, 31, 31, 0, 33, 33, 0, 35, 35, 0, 37, 37, 0, 39, 39, 0, 41, 41, 0, 43, 43, 0, 45, 45, 0, 47, 47, 0, 49, 49, 0, 51, 51, 0, 53, 53, 0 (list; graph; listen)

	OFFSET	`0,5`
	FORMULA	`G.f.: x(1+x+x^3+x^4)/(1-2x^3+x^6); a(n)=A011655(n)A004396(n)=floor((2n+1)/3)(2/3)(1-cos(2Pin/3)).` `a(n)=\|A120691(n+1)\| for n>0 ; a(n)=([n/3]2+1)dist(n,3Z). - M. F. Hasler (maximilian.hasler(AT)gmail.com), Dec 13 2007`
	PROGRAM	`(PARI) A102899(n)=(n\32+1)(0<n%3) - M. F. Hasler (maximilian.hasler(AT)gmail.com), Dec 13 2007`
	CROSSREFS	`Cf. A120691, A003417.` `Adjacent sequences: A102896 A102897 A102898 this_sequence A102900 A102901 A102902` `Sequence in context: A116580 A096439 A128046 this_sequence A072689 A021972 A117234`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 17 2005`

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

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