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A179989
The number of bijections f:{1,...,n}->Z/nZ such that f(ab)=f(a)+f(b) whenever all three function values are defined.
1
1, 1, 2, 2, 8, 10, 36, 40, 24, 20, 140, 136, 936, 624, 416, 256, 3648, 2088, 30240, 16704, 9792, 9000, 103488, 86400, 72960, 36576, 22896, 12096, 134400, 105216, 2671200, 1708800, 794400, 396288, 145152, 109440, 3594240, 2244672, 1202688, 660480
OFFSET
1,3
COMMENTS
Such functions are called logarithms.
CROSSREFS
Sequence in context: A325102 A275436 A202736 * A046982 A015620 A374305
KEYWORD
nonn
AUTHOR
James McKee (james.mckee(AT)rhul.ac.uk), Aug 05 2010
STATUS
approved