a: =proc(n)选项记忆`如果`(n<6,[0$3,14,378,4804][n],
((-460961029024*n^4+54902186125572*n^3-347074341314956*n^2)
+421934757637074*编号+6838164520124)*a(n-1)+(104238656896016*编号4
-2317913124589048*n^3+16535317231755832*n^2-44274446438628908*n
+29901662719961532)*a(n-2)+(-391233321452352*n^4
+7447800734464704*n^3-48294258553516272*n^2+122447135865649584*n
-105955729051546080)*a(n-3))/(286655151052*n^4-1210962058579*n^3
+4322649356693*n^2-24951473774234*n-30771740340558))
结束时间:
seq(a(n),n=4..30);
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