A057387 Low-temperature susceptibility expansion for hexagonal lattice (Potts model, q=4).

3, 0, 0, 0, 36, 72, -72, 0, 711, 1080, 144, -2556, 12852, 23004, -504, -21192, 122877, 525996, 69366, -531576, 1970154, 7833756, 6613164, -12953124, 24243261, 137623572, 130318974, -138059232, 115953372, 2338653528

Offset: 0

Author

N. J. A. Sloane, Aug 30 2000

Keywords

• sign

Comments

The hexagonal lattice is the familiar 2-dimensional lattice in which each point has 6 neighbors. This is sometimes called the triangular lattice.

Links

• I. Jensen, Table of n, a(n) for n = 0..53 (from link below)
• I. Jensen, More terms
• G. Nebe and N. J. A. Sloane, Home page for hexagonal (or triangular) lattice A2

Crossrefs

Cf. A057374-A057405.