Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A030227
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A030227 Number of n-celled polyominoes with bilateral symmetry. +0
2
1, 1, 2, 3, 6, 10, 20, 34, 70, 121, 250, 441, 912, 1630, 3375, 6092, 12624, 22961, 47616, 87136, 180811, 332549 (list; graph; listen)
OFFSET

1,3
COMMENT

Polyominoes with n cells and at least one line of reflection symmetry. - Joshua Zucker, Mar 08 2008

CROSSREFS

Cf. A000105, A006746.

Sequence in context: A135452 A077027 A030436 this_sequence A061551 A026034 A037031

Adjacent sequences: A030224 A030225 A030226 this_sequence A030228 A030229 A030230

KEYWORD

nonn

AUTHOR

Dave Wilson

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified December 9 18:50 EST 2009. Contains 170568 sequences.

AT&T Labs Research

Legal Notice
© 2009 AT&T Intellectual Property. All Rights Reserved.