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%I #9 Jun 03 2021 19:23:19
%S 1,19,233,2351,21273,179823,1452361,11360767,86821625,652052687,
%T 4832272809,35441720223,257820455257,1863247878511,13394300154377,
%U 95871638560319,683779284669369,4862556240775695,34494638612661865
%N Expansion of 1/((1-2x)(1-4x)(1-6x)(1-7x)).
%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (19,-128,356,-336).
%F a(n) = -2^n/5 +16*4^n/3 -27*6^n/1 +343*7^n/15. - _R. J. Mathar_, Jun 20 2013
%t CoefficientList[Series[1/((1-2x)(1-4x)(1-6x)(1-7x)),{x,0,30}],x] (* or *) LinearRecurrence[{19,-128,356,-336},{1,19,233,2351},30] (* _Harvey P. Dale_, Jun 03 2021 *)
%K nonn,easy
%O 0,2
%A _N. J. A. Sloane_.