

A068599


Number of nuniform tilings.


3




OFFSET

1,1


COMMENTS

Sequence gives the number of edgetoedge regularpolygon tilings having n topologically distinct vertex types. Allows tilings with two or more vertex types having the same arrangement of surrounding polygons, as long as those vertices are topologically distinct.
There are eleven 1uniform tilings (also called the "Archimedean" tessellations) which comprise the three regular tessellations (all triangles, squares, or hexagons) plus the eight semiregular tessellations.


REFERENCES

B. Grünbaum and G. C. Shephard, Tilings and Patterns, an Introduction, Freeman, 1989; Exercise *6 on p. 70. See Sections 2.1 and 2.2.


LINKS

Table of n, a(n) for n=1..6.
D. P. Chavey, Periodic tilings and tilings by regular polygons, PhD thesis, Univ of Wisconsin, Madison, 1984 (gives a(3)).
Steven Dutch, Uniform Tilings
Brian L. Galebach, nUniform Tilings
Ng Lay Ling, Honours Project  Tilings and Patterns.
Eric Weisstein's World of Mathematics, Uniform Tessellation


CROSSREFS

Cf. A068600.
Sequence in context: A058497 A134782 A067969 * A180113 A198310 A085187
Adjacent sequences: A068596 A068597 A068598 * A068600 A068601 A068602


KEYWORD

hard,nice,more,nonn


AUTHOR

Brian Galebach, Mar 28 2002


EXTENSIONS

151 and 332 found by Brian Galebach on Apr 30 2002, 673 on Aug 06 2003


STATUS

approved



