|
| |
|
|
A151526
|
|
Number of strip poly-IH64-tiles (holes allowed) with n cells.
|
|
4
| |
|
|
1, 2, 4, 8, 19, 43, 103, 239, 569, 1339, 3185, 7503, 17794, 41908, 99137, 233251, 550624, 1294032, 3049412, 7158698, 16844717, 39505579, 92841149
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| Equivalently, strip polyominoes where two polyominoes are considered the same if and only if they are related by a translation or a reflection in a horizontal line. Formerly described as one-sided strip polyrects, but that is A151523.
|
|
|
REFERENCES
| Branko Gruenbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 6.2 and 9.4.
|
|
|
CROSSREFS
| Strip polyominoes by group of symmetries relating shapes considered the same: A002013 (all symmetries), A182644 (translations only), A151514 (rotations and translations), A151527 (horizontal and vertical reflections, rotations of order 2 and translations), A151524 (reflections in either diagonal, rotations of order 2 and translations), A151523 (rotations of order 2 and translations), A151526 (reflections in a horizontal line and translations), A182646 (reflections in a NE-SW diagonal line and translations)
Sequence in context: A139784 A199694 A037444 * A099526 A005703 A172383
Adjacent sequences: A151523 A151524 A151525 * A151527 A151528 A151529
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Ed Pegg, Jr., (ed(AT)mathpuzzle.com), May 13 2009
|
|
|
EXTENSIONS
| Edited and a(15)-a(23) by Joseph Myers (jsm(AT)polyomino.org.uk), Nov 24 2010
|
| |
|
|
