表[分段[{{9,n==2},{94,n==3}},2n(2^n)+(5n^6-21n^5+47n^4-51n^3+8n^2-24n+12)/12],{n,20}]
连接[{2,9,94},LinearRecurrence[{11,-53,147,-259,301,-231,113,-32,4},{777,3286,10771,29366,69873,149950,297111,553114,980953},20]]
系数列表[级数[(2-13 x+101 x ^2-74 x ^3-1084 x ^4+3717 x ^5-7077 x ^6+9470 x ^7-7634 x ^8+3876 x ^9-1128 x ^10+144 x ^11)/((1-x)^7(1-2 x)^2),{x,0,20}],x]