A098534 - OEIS

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A098534

Mod 3 analogue of Stern's diatomic series.

0, 1, 1, 2, 3, 2, 2, 4, 3, 4, 7, 5, 6, 5, 5, 4, 6, 4, 4, 8, 6, 8, 8, 7, 6, 10, 7, 8, 15, 11, 14, 10, 12, 10, 13, 11, 12, 11, 11, 10, 12, 10, 10, 11, 9, 8, 14, 10, 12, 10, 10, 8, 12, 8, 8, 16, 12, 16, 13, 14, 12, 17, 14, 16, 18, 16, 16, 17, 15, 14, 17, 13, 12, 22, 16, 20, 18, 17, 14, 22 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	COMMENTS	`Essentially diagonal sums of Pascal's triangle modulo 3.`
	FORMULA	`a(n)=sum{k=0..floor((n-1)/2), mod(binomial(n-k-1, k), 3)}`
	CROSSREFS	`Cf. A002487, A051638.` `Sequence in context: A193827 A131340 A175470 * A002307 A029247 A194020` `Adjacent sequences: A098531 A098532 A098533 * A098535 A098536 A098537`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 13 2004`

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Last modified February 15 09:39 EST 2012. Contains 205753 sequences.