|
| |
|
|
A057730
|
|
Number of polyominoes (A000105) with perimeter 2n.
|
|
7
| | |
|
|
|
OFFSET
| 1,4
|
|
|
COMMENTS
| Does this include polyominoes with holes? - Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Sep 12 2006. Answer from R. J. Mathar: Yes! See the illustrations in the links.
|
|
|
LINKS
| Andrew Clarke, Isometrical Polyominoes
Andrew Clarke, Picture from Andrew Clarke's page showing the polyominoes of perimeters 4, 6, 8 and 10.
R. J. Mathar, Illustrating perimeter 14
R. J. Mathar, Illustrating perimeter 16
R. J. Mathar, Illustrating perimeter 18
|
|
|
CROSSREFS
| Cf. A000105, A057753, A002931.
Sequence in context: A148661 A148662 A148663 * A074432 A137089 A197470
Adjacent sequences: A057727 A057728 A057729 * A057731 A057732 A057733
|
|
|
KEYWORD
| nonn,nice,more
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Oct 29 2000
|
|
|
EXTENSIONS
| Additional comments from Barry Cipra (bcipra(AT)rconnect.com), Jun 08 2004
Link updated by William Rex Marshall (w.r.marshall(AT)actrix.co.nz), Dec 16 2009
|
| |
|
|
