A063381 - OEIS

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A063381

Number of orbits of the group of units of Z/(n) acting naturally on the 4-subsets of Z/(n).

1, 2, 9, 7, 24, 24, 56, 34, 151, 62, 173, 187, 264, 151, 530, 218, 679 (list; graph; refs; listen; history; internal format)

	OFFSET	`3,2`
	EXAMPLE	`a(5) = 2 since when U(5) = {1,2,3,4} acts naturally on the five 4-subsets {0,1,2,3}, {0,1,2,4}, {0,1,3,4}, {0,2,3,4}, {1,2,3,4} of Z/(5) the orbits are {{0,1,2,3},{0,1,2,4}, {0,1,3,4}, {0,2,3,4}} and {{1,2,3,4}}.`
	CROSSREFS	`Cf. A063379, A065957, A000005, A056376 + 1, A056371 - 1` `Sequence in context: A121837 A160439 A137453 * A019078 A205384 A199181` `Adjacent sequences: A063378 A063379 A063380 * A063382 A063383 A063384`
	KEYWORD	`nonn`
	AUTHOR	`W. Edwin Clark (eclark(AT)math.usf.edu), Jul 15 2001`

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