id:A011920 - OEIS Search Results

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a(n) = b(n)*(b(n)+1) = b(n) + ... + c(n), where b(n) = A011916(n), c(n) = A011918(n).

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12, 1980, 378840, 73419192, 14241916260, 2762844014580, 535977297450672, 103976830083273840, 3913064012542622257452 (list; graph; listen)

	OFFSET	`1,1`
	REFERENCES	`Mario VELUCCHI "Seeing couples" in Recreational and Educational Computing, to appear 1997.`
	CROSSREFS	`Sequence in context: A049406 A104009 A015028 this_sequence A004823 A009063 A012675` `Adjacent sequences: A011917 A011918 A011919 this_sequence A011921 A011922 A011923`
	KEYWORD	`nonn,easy`
	AUTHOR	`Mario Velucchi (mathchess(AT)velucchi.it)`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.