

A235858


Associated with random PenroseRobinson tilings of the plane.


4




OFFSET

0,2


COMMENTS

In the Mathematica code, let p=A235857; q=A235858 for convenience.


LINKS

Table of n, a(n) for n=0..5.
Steven R. Finch, Substitution dynamics, January 23, 2014. [Cached copy, with permission of the author]
C. Godrèche and J. M. Luck, Quasiperiodicity and randomness in tilings of the plane, J. Statist. Phys. 55 (1989) 128.


MATHEMATICA

p[n_] := p[n] = 2 p[n1] q[n1]  p[n1]^2 q[n2];
q[n_] := 2 p[n] q[n1]  p[n1] p[n2] q[n1] q[n2]^2;
p[0] = 1; q[0] = 1; p[1] = 2; q[1] = 4;


CROSSREFS

Cf. A072042, A235857.
Sequence in context: A195373 A065754 A244013 * A262409 A183880 A220318
Adjacent sequences: A235855 A235856 A235857 * A235859 A235860 A235861


KEYWORD

nonn


AUTHOR

Steven Finch, Jan 16 2014


STATUS

approved



