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