a2m三 (-1)"a0 22mm:(n+1)(n+2)…(n+n) 一般项为 do xn+2m 22mm!(n+1)(n+2)…(n+n) (n+m)(n+n-1).(n+2)(n+1)T(n+1)=T(n+m+1) 1 1 ao=2"T(n+1) a2m=(-1)" 2n+2mm!Γ(n+m+1) y=之(-1)” +2m i=0 2+2"m!T(n+m+1) ,h≥0 55 0 2 2 ( 1) 2 !( 1)( 2) ( ) m m m a a m n n n m 一般项为 0 2 2 ( 1) 2 !( 1)( 2) ( ) m n m m a x m n n n m ( )( 1) ( 2)( 1) ( 1) ( 1) n m n m n n n n m 2 2 1 ( 1) 2 ! ( 1) m m n m a m n m 2 1 2 0 ( 1) , 0 2 ! ( 1) n m m n m m x y n m n m 0 1 2 ( 1) n a n