%I #6 Jun 13 2015 00:49:05
%S 1,18,211,2052,18025,148806,1179487,9089784,68647909,510709914,
%T 3756191803,27381204396,198197187553,1426557620142,10220981500759,
%U 72957382445088,519164877763357,3684933735388290,26099214855723955
%N Expansion of 1/((1-2x)(1-3x)(1-6x)(1-7x)).
%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (18,-113,288,-252).
%F a(n) = -3*6^(n+1) -2^(n+1)/5 +7^(n+3)/20 + 3^(n+2)/4. - _R. J. Mathar_, May 22 2013
%K nonn
%O 0,2
%A _N. J. A. Sloane_.