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A fractal sequence.
4

%I #7 Mar 30 2012 18:39:18

%S 2,3,3,2,0,0,-1,0,0,-1,0,0,2,3,6,8,9,12,14,18,21,23,24,24,26,27,30,32,

%T 33,33,32,33,33,35,36,36,38,39,42,44,45,45,44,45,45,47,48,48,47,45,45,

%U 44,45,45,44,42,39,38,36,36,35,33,33,32,33,33,32,30,27,26,24,24,23,21,18,14,12,9,8,6,3,2,0,0,-1,0,0,-1,0,0,2,3,3,2,0

%N A fractal sequence.

%H Boris Gourevitch, <a href="http://membres.lycos.fr/bgourevitch/temporaires/benoit/sqrt3fractal.jpg">Graph of A083057</a>

%F a(n)=sum(k=1, n, A083056(k))

%Y Cf. A083038, A083054, A083055, A083056.

%K sign

%O 1,1

%A _Benoit Cloitre_, Apr 18 2003