数列{an}满足=3an-1+3^n-1,(n≥2),a4=365,an的前n项之和为Sn,求Sn

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数列{an}满足=3an-1+3^n-1,(n≥2),a4=365,an的前n项之和为Sn,求Sn数列{an}满足=3an-1+3^n-1,(n≥2),a4=365,an的前n项之和为Sn,求Sn数列

数列{an}满足=3an-1+3^n-1,(n≥2),a4=365,an的前n项之和为Sn,求Sn
数列{an}满足=3an-1+3^n-1,(n≥2),a4=365,an的前n项之和为Sn,求Sn

数列{an}满足=3an-1+3^n-1,(n≥2),a4=365,an的前n项之和为Sn,求Sn
a1=5
an=-3^n/2+2 (n≥2)