A174942 - OEIS

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A174942

a(n) = Sum_{k<=n} A007955(k) * A008683(n-k+1) = Sum_{k<=n} A007955(k) * mu(n-k+1), where A007955(m) = product of divisors of m.

1, 1, 0, 3, -7, 22, -36, 14, -44, -29, -91, 1525, -1692, -1686, 109, -1246, 534, 2818, -5769, 1034, -5042, -16561, 5185, 315777, -321633, -338860, 5749, -319896, 318256, 441483 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,4`
	LINKS	`Table of n, a(n) for n=1..30.`
	EXAMPLE	`For n = 4, A007955(n) = b(n): a(4) = b(1)mu(4) + b(2)mu(3) + b(3)* mu(2) + b(4)mu(1) = 10 + 2(-1) + 3(-1) + 8*1 = 3.`
	CROSSREFS	`Sequence in context: A177820 A174230 A158236 * A128599 A182174 A080882` `Adjacent sequences: A174939 A174940 A174941 * A174943 A174944 A174945`
	KEYWORD	`sign`
	AUTHOR	`Jaroslav Krizek, Apr 02 2010`
	STATUS	`approved`

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Last modified February 22 15:46 EST 2019. Contains 320399 sequences. (Running on oeis4.)