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

3,2

LINKS

Table of n, a(n) for n=3..19.

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: A245287 A254595 A137453 * A019078 A205384 A199181

Adjacent sequences:  A063378 A063379 A063380 * A063382 A063383 A063384

KEYWORD

nonn

AUTHOR

W. Edwin Clark, Jul 15 2001

STATUS

approved

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Last modified August 24 03:51 EDT 2019. Contains 326260 sequences. (Running on oeis4.)