OFFSET
0,2
COMMENTS
"Connected" means "connected by edges".
Rotations and reflections are considered different (cf. A056786).
Internal arrangement of dominoes is significant (cf. A056785). - Aaron N. Siegel, May 22 2022
LINKS
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.
CROSSREFS
KEYWORD
nonn,more,nice,hard
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
a(10) from Aaron N. Siegel, May 22 2022
STATUS
approved