Search: id:A151689
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%I A151689
%S A151689 2,6,4,6,16,16,6,6,16,16,18,40,50,30,8,6,16,16,18,40,50,30,20,40,50,54,
%T A151689 100,142,112,48,10,6,16,16,18,40,50,30,20,40,50,54,100,142,112,48,22,40,
%U A151689 50,54,100,142,112,72,102,142,160,256,386,368,210,70,12,6,16,16,18,40,
               50
%N A151689 a(n) = sum_{k >= 1} 2^wt(k) * binomial(wt(n+k),k).
%p A151689 wt := proc(n) local w,m,i;
%p A151689 w := 0; m := n; while m > 0 do i := m mod 2; w := w+i; m := (m-i)/2; 
               od; w; end:
%p A151689 f := n->add( 2^k*binomial(wt(n+k),k),k=1..20 );
%Y A151689 Cf. A151685, A151690.
%Y A151689 Sequence in context: A119250 A059773 A127399 this_sequence A088438 A097265 
               A074208
%Y A151689 Adjacent sequences: A151686 A151687 A151688 this_sequence A151690 A151691 
               A151692
%K A151689 nonn
%O A151689 0,1
%A A151689 N. J. A. Sloane (njas(AT)research.att.com), Jun 04 2009

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