A024169 - OEIS

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A024169

[ (2nd elementary symmetric function of 1,2,..,n)/(1+2+...+n) ].

0, 0, 1, 3, 5, 8, 11, 15, 19, 24, 29, 34, 41, 47, 54, 62, 70, 79, 88, 98, 108, 119, 130, 141, 154, 166, 179, 193, 207, 222, 237, 253, 269, 286, 303, 320, 339, 357, 376, 396, 416, 437, 458, 480, 502 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,4`
	FORMULA	`a(n) = floor( A000914(n-1)/A000217(n)). Conjecture: g.f.: x^3(-1-x-x^5-2x^7+x^4+x^8)/((x^2+1) * (1+x+x^2) * (x^4-x^2+1) * (x-1)^3). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 15 2009]`
	CROSSREFS	`Sequence in context: A046992 A001463 A145197 * A078126 A024206 A159325` `Adjacent sequences: A024166 A024167 A024168 * A024170 A024171 A024172`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified February 15 05:45 EST 2012. Contains 205694 sequences.