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Table of n, a(n) for n=0..22.
J. Choi, N. Pippenger, Counting the Angels and Devils in Escher's Circle Limit IV, arXiv preprint arXiv:1310.1357, 2013
Sequence in context: A010575 A162949 A063812 * A163347 A163924 A164373
Adjacent sequences: A234271 A234272 A234273 * A234275 A234276 A234277
N. J. A. Sloane, Dec 24 2013