login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A075216 Number of polyiamonds with 2n cells that tile the plane by translation. 10
1, 2, 8, 24, 62, 291, 539, 2625, 6177, 21923, 37721, 238267, 299203, 1338140, 3492733 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Polyiamonds with an odd number of cells have different numbers of triangles with the two orientations and so cannot tile by translation.

REFERENCES

Branko Gr├╝nbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.

LINKS

Table of n, a(n) for n=1..15.

Joseph Myers, Polyiamond tiling

CROSSREFS

Cf. A071332, A075217, A075218, A075219, A075220, A075221, A075222, A075223, A075224, A075198, A075207.

Sequence in context: A006728 A234933 A222808 * A127790 A006730 A131135

Adjacent sequences:  A075213 A075214 A075215 * A075217 A075218 A075219

KEYWORD

hard,nonn

AUTHOR

Joseph Myers, Sep 08 2002

EXTENSIONS

More terms from Joseph Myers, Nov 11 2003

a(15) (30-iamonds) from Joseph Myers, Nov 21 2010

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 21 01:33 EST 2019. Contains 329349 sequences. (Running on oeis4.)