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%I #11 Jul 29 2017 12:43:17
%S 1,2,5,18,65,238,877,3234,11929,44006,162341,598890,2209361,8150542,
%T 30068125,110924178,409209865,1509614198,5569110677,20544980154,
%U 75792390209,279605352286,1031490797581,3805267877730,14037995932921
%N Partial sums of A084519. Positions of ones in the first differences of A084516.
%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (3, 2, 2).
%F Empirical G.f.: x*(1-2*x-2*x^2)/((1-x)*(1-3*x-2*x^2-2*x^3)). [_Colin Barker_, Apr 17 2012]
%t Accumulate[LinearRecurrence[{3,2,2},{1,1,3},30]] (* _Harvey P. Dale_, Jul 20 2013 *)
%K nonn
%O 1,2
%A _Antti Karttunen_, Jun 02 2003
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