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G.f.: (1+x)*(1+x+x^2+x^3+x^4)/(1-6*x-6*x^2-6*x^3+x^4).
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%I #12 Mar 03 2024 18:53:56

%S 1,8,56,392,2737,19103,133336,930664,6495881,45340183,316467032,

%T 2208887912,15417674881,107612838767,751119942328,5242693847944,

%U 36593142099353,255414122498983,1782748630735352,12443292678154184,86852139446231761,606213670408228799,4231271866564953112

%N G.f.: (1+x)*(1+x+x^2+x^3+x^4)/(1-6*x-6*x^2-6*x^3+x^4).

%H J. Choi, N. Pippenger, <a href="http://arxiv.org/abs/1310.1357">Counting the Angels and Devils in Escher's Circle Limit IV</a>, arXiv preprint arXiv:1310.1357 [math.CO], 2013.

%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (6, 6, 6, -1).

%t Join[{1, 8}, LinearRecurrence[{6, 6, 6, -1}, {56, 392, 2737, 19103}, 21]] (* _Jean-François Alcover_, Feb 12 2019 *)

%K nonn

%O 0,2

%A _N. J. A. Sloane_, Dec 24 2013