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G.f.: (1+x+x^2+x^3)/(1-x^2-2*x^3-x^4+x^6).
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%I #12 Mar 03 2024 18:52:40

%S 1,1,2,4,5,9,14,22,35,55,88,138,219,347,548,868,1373,2173,3438,5440,

%T 8609,13621,21554,34106,53967,85395,135124,213814,338327,535351,

%U 847112,1340424,2121017,3356185,5310650,8403292,13296925,21040353,33293142,52681310,83360123,131904655,208718960,330265858,522595251

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

%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_06">Index entries for linear recurrences with constant coefficients</a>, signature (0, 1, 2, 1, 0, -1).

%t LinearRecurrence[{0, 1, 2, 1, 0, -1}, {1, 1, 2, 4, 5, 9}, 45] (* _Jean-François Alcover_, Feb 12 2019 *)

%K nonn

%O 0,3

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