id:A129889 - OEIS Search Results

Search: id:A129889

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Write down n, then n(n+1).

+0
2

0, 0, 1, 2, 2, 6, 3, 12, 4, 20, 5, 30, 6, 42, 7, 56, 8, 72, 9, 90, 10, 110, 11, 132, 12, 156, 13, 182, 14, 210, 15, 240, 16, 272, 17, 306, 18, 342, 19, 380, 20, 420, 21, 462, 22, 506, 23, 552, 24, 600, 25, 650, 26, 702, 27, 756, 28, 812, 29, 870, 30, 930, 31, 992, 32, 1056, 33 (list; graph; listen)

	OFFSET	`0,4`
	MAPLE	`f:=n-> if n mod 2 = 0 then n/2 else (n^2-1)/4; fi;`
	CROSSREFS	`Sequence in context: A100641 A028421 A081745 this_sequence A130712 A130728 A092384` `Adjacent sequences: A129886 A129887 A129888 this_sequence A129890 A129891 A129892`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), May 26 2007`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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