id:A008133 - OEIS Search Results

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floor(n/3)*floor((n+1)/3).

+0
1

0, 0, 0, 1, 1, 2, 4, 4, 6, 9, 9, 12, 16, 16, 20, 25, 25, 30, 36, 36, 42, 49, 49, 56, 64, 64, 72, 81, 81, 90, 100, 100, 110, 121, 121, 132, 144, 144, 156, 169, 169, 182, 196, 196, 210, 225, 225, 240, 256, 256, 272, 289 (list; graph; listen)

	OFFSET	`0,6`
	FORMULA	`Partial sums of A087509. a(n+1)=sum{j=0..n, sum{k=0..j, if (mod(jk, 3)=2, 1, 0) }} - Paul Barry (pbarry(AT)wit.ie), Sep 14 2003`
	CROSSREFS	`Sequence in context: A023847 A000061 A112921 this_sequence A022471 A081238 A002086` `Adjacent sequences: A008130 A008131 A008132 this_sequence A008134 A008135 A008136`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research