A235857 Associated with random Penrose-Robinson tilings of the plane.

1, 2, 12, 1536, 519045120, 156130677884314787512320, 12538151702000091464104493325082133822247601116646227522355200

Offset: 0

Author

Steven Finch, Jan 16 2014

Keywords

• nonn

Comments

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

Links

• 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) 1-28.

Crossrefs

Cf. A072042, A235858.

Programs

Mathematica

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