%I #9 Oct 01 2023 02:23:04
%S 1,18,209,1998,17157,137970,1063273,7962966,58471853,423482202,
%T 3037367697,21634921854,153344743189,1083048862914,7630057197881,
%U 53656123623462,376830071424765,2644030889883306,18539455617424225
%N Expansion of 1/((1-2x)(1-4x)(1-5x)(1-7x)).
%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (18, -115, 306, -280).
%F a(n) = -4*2^n/15 +32*4^n/3 -125*5^n/6 +343*7^n/30. - _R. J. Mathar_, Jun 20 2013
%K nonn,easy
%O 0,2
%A _N. J. A. Sloane_.