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%I #13 Oct 02 2023 13:50:02
%S 1,5,21,83,318,1196,4445,16389,60097,219527,799734,2907800,10558041,
%T 38297573,138819053,502925211,1821362830,6594366404,23870720757,
%U 86396702117,312668994969,1131463798415,4094241931526,14814592074288,53603587025713,193949782284101
%N Expansion of (1-x)*(1-2x)/((1-5x+5*x^2)*(1-3x+x^2)).
%C A diagonal of the square array A217770.
%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (8, -21, 20, -5).
%F a(n) = A217770(n,n+3).
%F a(n) = 8*a(n-1) -21*a(n-2) + 20*a(n-3) -5*a(n-4) for n>=4, a(0) = 1, a(1) = 5, a(2) = 21, a(3) = 83.
%Y Cf. A217770, A217777, A217778, A217779, A217782.
%K nonn,easy
%O 0,2
%A _Philippe Deléham_, Mar 24 2013
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