id:A011861 - OEIS Search Results

Search: id:A011861

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[ n(n-1)/8 ].

+0
3

0, 0, 0, 0, 1, 2, 3, 5, 7, 9, 11, 13, 16, 19, 22, 26, 30, 34, 38, 42, 47, 52, 57, 63, 69, 75, 81, 87, 94, 101, 108, 116, 124, 132, 140, 148, 157, 166, 175, 185, 195, 205, 215, 225, 236, 247, 258, 270, 282, 294, 306, 318 (list; graph; listen)

	OFFSET	`0,6`
	MAPLE	`seq(floor(binomial(n, 2)/4), n=0..51); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 12 2009]` `seq(floor(binomial(n, 2)/4) , n=0..51); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 12 2009]`
	CROSSREFS	`Sequence in context: A033055 A022554 A097046 this_sequence A065520 A090332 A070566` `Adjacent sequences: A011858 A011859 A011860 this_sequence A011862 A011863 A011864`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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