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Floor(((1+sqrt(7))/2)^n).
0

%I #8 Mar 15 2014 11:54:57

%S 1,1,3,6,11,20,36,66,121,222,405,738,1346,2453,4472,8153,14863,27093,

%T 49388,90029,164112,299156,545324,994058,1812045,3303133,6021201,

%U 10975901,20007704,36471557,66483113,121190448,220915119,402700792

%N Floor(((1+sqrt(7))/2)^n).

%t Table[Floor[((1 + Sqrt[7])/2)^n], {n, 0, 100}]

%Y Cf. A125890-A125899.

%K nonn

%O 0,3

%A _Artur Jasinski_, Dec 13 2006

%E Added a(0)=1 - _Jon Perry_, Mar 15 2014