Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
Mermin, N. David; Rokhsar, Daniel S.; and Wright, David C.; Beware of 46-fold symmetry: the classification of two-dimensional quasicrystallographic lattices. Phys. Rev. Lett. 58 (1987), 2099-2101.
Table of n, a(n) for n=1..29.
Sequence in context: A080682 A182049 A038770 * A032517 A062996 A085380
Adjacent sequences: A193173 A193174 A193175 * A193177 A193178 A193179
N. J. A. Sloane, Jul 17 2011