A006546 - OEIS

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A006546

Number of elements (a b, c d) in SL(2,Z) with trace n and 0 <= a <= {b, c} <= d.

1, 2, 2, 3, 3, 4, 2, 8, 3, 4, 6, 8, 6, 8, 4, 10, 6, 14, 2, 18, 6, 4, 14, 18, 7, 12, 12, 22, 6, 8, 6, 31, 12, 12, 14, 28, 8, 28, 12, 18, 22 (list; graph; refs; listen; history; internal format)

	OFFSET	`3,2`
	CROSSREFS	`Sequence in context: A091220 A057955 A116473 * A031268 A189025 A045430` `Adjacent sequences: A006543 A006544 A006545 * A006547 A006548 A006549`
	KEYWORD	`nonn`
	AUTHOR	`John Lewis (frc.mass.edu)`

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Last modified February 16 12:12 EST 2012. Contains 205908 sequences.