

A216598


Number of distinct connected planar figures that can be formed from n 1 X 2 rectangles (or dominoes).


6




OFFSET

0,2


COMMENTS

"Connected" means "connected by edges".
Rotations and reflections are considered different (cf. A056786).


LINKS

Table of n, a(n) for n=0..9.
Manfred Scheucher, Sage Script
N. J. A. Sloane, Illustration of initial terms of A056786, A216598, A216583, A216595, A216492, A216581
N. J. A. Sloane, Illustration of third term of A056786, A216598, A216583, A216595, A216492, A216581 (a better drawing for the third term)
M. Vicher, Polyforms
Index entries for sequences related to dominoes


CROSSREFS

Cf. A056786, A216598, A216583, A216595, A216492, A216581.
Sequence in context: A011552 A326362 A287222 * A219397 A275912 A181914
Adjacent sequences: A216595 A216596 A216597 * A216599 A216600 A216601


KEYWORD

nonn,more,nice


AUTHOR

N. J. A. Sloane, Sep 09 2012


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
a(5)a(9) from Manfred Scheucher, Jun 06 2015


STATUS

approved



