12．（2023•湖北二模）已知定义在RRR上的函数f(x)f(x)f(x)是奇函数，且满足f(3−x)=f(x)f(3-x)=f(x)f(3−x)=f(x)，f(−1)=3f(-1)=3f(−1)=3，数列{an}\{a_{n}\}{an}满足a1=1a_{1}=1a1=1且an=n(an+1−an)(n∈N∗){a}_{n}=n({a}_{n+1}-{a}_{n})(n\in {N}^{*})an=n(an+1−an)(n∈N∗)，则f(a36)+f(a37)=(f(a_{36})+f(a_{37})=(f(a36)+f(a37)=( )))