

A040173


Numerator of probability that 2 elements of S_n chosen at random (with replacement) generate S_n.


3



1, 3, 1, 3, 19, 53, 103, 4111, 78293, 29401, 4462987, 9830941, 284397779
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OFFSET

1,2


LINKS



EXAMPLE

Values for n=1,2,3,... are 1, 3/4, 1/2, 3/8, 19/40, 53/120, 103/168, 4111/6720, 78293/120960, ...


CROSSREFS



KEYWORD

nonn,nice,frac,more


AUTHOR



EXTENSIONS



STATUS

approved



