The number of bijections f:{1,...,n}->Z/nZ such that f(ab)=f(a)+f(b) whenever all three function values are defined.
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.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =2a(4) =8a(5) =10a(6) =36a(7) =40a(8) =24a(9) =20a(10) =140a(11) =136a(12) =936a(13) =624a(14) =416a(15) =256a(16) =3648a(17) =2088a(18) =30240a(19) =16704a(20) =9792a(21) =9000a(22) =103488a(23) =86400a(24) =72960a(25) =36576a(26) =22896a(27) =12096a(28) =134400a(29) =105216
External references
- oeis: A179989