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A234273 G.f.: (1+x+x^2+x^3)/(1-x^2-2*x^3-x^4+x^6). 0
1, 1, 2, 4, 5, 9, 14, 22, 35, 55, 88, 138, 219, 347, 548, 868, 1373, 2173, 3438, 5440, 8609, 13621, 21554, 34106, 53967, 85395, 135124, 213814, 338327, 535351, 847112, 1340424, 2121017, 3356185, 5310650, 8403292, 13296925, 21040353, 33293142, 52681310, 83360123, 131904655, 208718960, 330265858, 522595251 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..44.

J. Choi, N. Pippenger, Counting the Angels and Devils in Escher's Circle Limit IV, arXiv preprint arXiv:1310.1357 [math.CO], 2013.

MATHEMATICA

LinearRecurrence[{0, 1, 2, 1, 0, -1}, {1, 1, 2, 4, 5, 9}, 45] (* Jean-François Alcover, Feb 12 2019 *)

CROSSREFS

Sequence in context: A073154 A238656 A077882 * A120939 A213290 A277852

Adjacent sequences:  A234270 A234271 A234272 * A234274 A234275 A234276

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 24 2013

STATUS

approved

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Last modified October 23 07:11 EDT 2019. Contains 328336 sequences. (Running on oeis4.)