login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A309159 Number of generalized polyforms on the snub square tiling with n cells. 11
1, 2, 2, 4, 10, 28, 79, 235, 720, 2254, 7146, 22927, 74137, 241461, 790838, 2603210, 8604861, 28549166, 95027832, 317229779, 1061764660, 3562113987, 11976146355 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The generalized polyforms counted by this sequence are "free", which means that they are counted up to rotation and reflection.

LINKS

Table of n, a(n) for n=0..22.

Peter Kagey, Counting generalized polyominoes

Wikipedia, Snub square tiling

CROSSREFS

Cf. A000105, A000228, A000577.

Sequence in context: A298898 A339830 A078801 * A002420 A284016 A112556

Adjacent sequences:  A309156 A309157 A309158 * A309160 A309161 A309162

KEYWORD

nonn

AUTHOR

Peter Kagey and Peter Taylor, Jul 15 2019

EXTENSIONS

a(19)-a(22) from Christian Sievers

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 June 16 12:45 EDT 2021. Contains 345057 sequences. (Running on oeis4.)