A007203 - OEIS

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A007203

Number of elements (a b / c d) in GL(2,Z) with |det| = 1, trace n and 0 <= a <= {b, c} <= d.

1, 1, 2, 4, 3, 7, 4, 8, 6, 12, 5, 14, 7, 13, 13, 20, 5, 20, 10, 24, 14, 22, 12, 28, 18, 30, 14, 22, 17, 48, 12, 28, 19, 43, 19, 42, 25, 32, 23, 60 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	CROSSREFS	`Cf. A006546, A007104.` `Sequence in context: A051851 A011171 A181049 * A110412 A194031 A064357` `Adjacent sequences: A007200 A007201 A007202 * A007204 A007205 A007206`
	KEYWORD	`nonn`
	AUTHOR	`John Lewis (frc.mass.edu)`

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Last modified February 16 03:44 EST 2012. Contains 205860 sequences.