

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
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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



