id:A122461 - OEIS Search Results

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Repetitions of even numbers four times.

+0
2

0, 0, 0, 0, 2, 2, 2, 2, 4, 4, 4, 4, 6, 6, 6, 6, 8, 8, 8, 8, 10, 10, 10, 10, 12, 12, 12, 12, 14, 14, 14, 14, 16, 16, 16, 16, 18, 18, 18, 18, 20, 20, 20, 20, 22, 22, 22, 22, 24, 24, 24, 24, 26, 26, 26, 26, 28, 28, 28, 28, 30, 30, 30, 30, 32, 32, 32, 32, 34, 34, 34, 34, 36, 36, 36, 36 (list; graph; listen)

	OFFSET	`0,5`
	FORMULA	`a(n) = {Sum_{k=0..n} (k+1)cos[(n-k)Pi/2]}+1/4[2cos(n*Pi/2)+1+(-1)^n]-2, with n>=0 - Paolo P. Lava (ppl(AT)spl.at), May 15 2007`
	CROSSREFS	`Cf. A092533.` `Sequence in context: A072376 A131883 A113452 this_sequence A092533 A092532 A073504` `Adjacent sequences: A122458 A122459 A122460 this_sequence A122462 A122463 A122464`
	KEYWORD	`nonn`
	AUTHOR	`Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Oct 20 2006`

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Last modified September 7 15:23 EDT 2008. Contains 143483 sequences.

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