OFFSET
1,3
COMMENTS
a(7) >= 211. - Eric W. Weisstein, Jan 02 2022
LINKS
Jaskaran Singh Grover, Changliu Liu and Katia Sycara, Deadlock Analysis and Resolution for Multi-Robot Systems, (2020).
Eric Weisstein's World of Mathematics, Connected Graph
Eric Weisstein's World of Mathematics, Matchstick Graph
EXAMPLE
a(6) is one less than A059103(6) because the 3-prism graph Y_3 cannot be drawn in an embedding that is both planar and unit-distance.
There are 11 connected graphs on 7 nodes that are unit-distance but non-matchstick (including Y_3+e and the Moser spindle).
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Eric W. Weisstein, Apr 30 2018
STATUS
approved