[go: up one dir, main page]
login
The OEIS is supported by the many generous donors to the OEIS Foundation.
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A359661
a(n) is the number of free convex polyominoes of n cells.
0
1, 1, 2, 5, 11, 29, 72, 191, 478, 1211, 2973, 7274, 17455, 41645, 98271, 230848, 539000, 1254936
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
A convex polyomino is such that any vertical or horizontal line connecting two points within the polyomino remains completely within the polyomino.
It has a perimeter of length equal to that of its enclosing rectangle.
A polyomino is convex if and only if (i) it is a board-pile polyomino and (ii) rotated 90 degrees it is still a board-pile-polyomino.
LINKS
Table of n, a(n) for n=1..18.
CROSSREFS
Cf. A000105, A001169, A067675.
Sequence in context: A309857 A117719 A355516 * A316769 A192785 A334578
Adjacent sequences: A359658 A359659 A359660 * A359662 A359663 A359664
KEYWORD
nonn,more
AUTHOR
John Mason, Jan 10 2023
STATUS
approved

Lookup Welcome Wiki Register Music Plot 2 Demos Index WebCam Contribute Format Style Sheet Transforms Superseeker Recents
The OEIS Community
Maintained by The OEIS Foundation Inc.
Last modified October 5 00:39 EDT 2024. Contains 376527 sequences.
License Agreements, Terms of Use, Privacy Policy