id:A085542 - OEIS Search Results

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Determinant of the n X n matrix M_(i,j)=i/gcd(i,j)=lcm(i,j)/j.

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1, -1, 2, -2, 8, 16, -96, 96, -192, -768, 7680, 15360, -184320, -1105920, -8847360, 8847360, -141557760, -283115520, 5096079360, 20384317440, 244611809280, 2446118092800, -53814598041600, -107629196083200, 430516784332800, 5166201411993600, -10332402823987200 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n+1)/a(n)= A023900(n+1) the reciprocity balance of n+1`
	PROGRAM	`(PARI) a(n)=matdet(matrix(n, n, i, j, i/gcd(i, j)))`
	CROSSREFS	`Sequence in context: A052970 A109190 A016120 this_sequence A009725 A053098 A067640` `Adjacent sequences: A085539 A085540 A085541 this_sequence A085543 A085544 A085545`
	KEYWORD	`sign`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 19 2003`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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