%I #8 Jul 29 2019 17:46:58
%S 1,1,2,2,3,3,4,5,6,7,8,9,10,11,13,14,16,17,19,20,22,24,26,28,30,32,34,
%T 36,39,41,44,46,49,51,54,57,60,63,66,69,72,75,79,82,86,89,93,96,100,
%U 104,108,112,116,120,124,128
%N Expansion of 1/((1-x)(1-x^2)(1-x^7)).
%D L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 120, D(n;1,2,7).
%H <a href="/index/Rec#order_10">Index entries for linear recurrences with constant coefficients</a>, signature (1, 1, -1, 0, 0, 0, 1, -1, -1, 1).
%F round( (n+3)*(n+7)/28).
%F a(n) = +a(n-1) +a(n-2) -a(n-3) +a(n-7) -a(n-8) -a(n-9) +a(n-10). - _R. J. Mathar_, Jun 04 2013
%t CoefficientList[Series[1/((1-x)(1-x^2)(1-x^7)),{x,0,60}],x] (* or *) LinearRecurrence[{1,1,-1,0,0,0,1,-1,-1,1},{1,1,2,2,3,3,4,5,6,7},60] (* _Harvey P. Dale_, Jul 29 2019 *)
%K nonn
%O 0,3
%A _N. J. A. Sloane_.