%I #5 Feb 14 2018 21:12:29
%S 1,1,27,13831,44560468289,220167382952941205430116129,
%T 17280083176824678419775054525017769508688140582155308813842797363
%N f(f(n+1))-f(f(n)), where f(m) = Pell(m) = A000129(m).
%K nonn
%O 0,3
%A _N. J. A. Sloane_, Nov 12 2005
%E ~Definition corrected by _N. J. A. Sloane_, Feb 14 2018