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a(n) = sum_{k >= 0} binomial(wt(n+k),k+1), where wt() = A000120().
0

%I #2 Mar 30 2012 16:51:03

%S 0,1,2,2,2,4,5,3,2,4,5,5,7,10,9,4,2,4,5,5,7,10,9,6,7,10,11,13,18,20,

%T 14,5,2,4,5,5,7,10,9,6,7,10,11,13,18,20,14,7,7,10,11,13,18,20,16,14,

%U 18,22,25,32,39,35,20,6,2,4,5,5,7,10,9,6,7,10,11,13,18,20,14,7,7,10,11,13,18

%N a(n) = sum_{k >= 0} binomial(wt(n+k),k+1), where wt() = A000120().

%K nonn

%O 0,3

%A _N. J. A. Sloane_, Jun 01 2009