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a(n)=a(n-1)^3-2*a(n-2) with a(1)=1, a(2)=2.
1

%I #6 Sep 08 2022 08:45:53

%S 1,2,6,212,9528116,865009958745459864472,

%T 647236979404329414852005811109907426259024826523626405446225816

%N a(n)=a(n-1)^3-2*a(n-2) with a(1)=1, a(2)=2.

%H Vincenzo Librandi, <a href="/A176782/b176782.txt">Table of n, a(n) for n = 1..9</a>

%t RecurrenceTable[{a[1]==1,a[2]==2,a[n]==a[n-1]^3-2*a[n-2]},a,{n,10}] (* _Vincenzo Librandi_, Jul 15 2012 *)

%o (Magma) I:=[1, 2]; [n le 2 select I[n] else Self(n-1)^3-2*Self(n-2): n in [1..7]]; // _Vincenzo Librandi_, Jul 15 2012

%K nonn

%O 1,2

%A _Vincenzo Librandi_, Apr 26 2010