login
a(n) = [ tau*a(n-1) ] + a(n-2).
0

%I #8 Apr 11 2018 11:09:27

%S 0,2,3,6,12,25,52,109,228,477,999,2093,4385,9188,19251,40336,84516,

%T 177085,371045,777448,1628982,3413196,7151649,14984807,31397576,

%U 65787152,137843423,288822495,605168036

%N a(n) = [ tau*a(n-1) ] + a(n-2).

%t nxt[{a_,b_}]:={b,Floor[b*GoldenRatio]+a}; NestList[nxt,{0,2},30][[All,1]] (* _Harvey P. Dale_, Apr 11 2018 *)

%K nonn

%O 0,2

%A _N. J. A. Sloane_.