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

%I #4 Mar 30 2012 16:44:50

%S 0,1,1,2,3,6,10,19,35,65,121,226,421,786,1467,2738,5111,9541,17810,

%T 33247,62064,115858,216279,403741,753687,1406953,2626444,4902941,

%U 9152616,17085741,31894984

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

%K nonn

%O 0,4

%A _N. J. A. Sloane_.