|
|
A216598
|
|
Number of distinct connected planar figures that can be formed from n 1 X 2 rectangles (or dominoes).
|
|
6
|
|
|
1, 2, 16, 164, 1866, 22518, 282184, 3630256, 47614214, 633835642, 8537220172
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
COMMENTS
|
"Connected" means "connected by edges".
Rotations and reflections are considered different (cf. A056786).
|
|
LINKS
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,more,nice,hard
|
|
AUTHOR
|
|
|
EXTENSIONS
|
a(4) found via equivalence class decomposition over bounding boxes by the Forest Grove Community School Math Club - Markus J. Q. Roberts, Apr 03 2013
|
|
STATUS
|
approved
|
|
|
|