OFFSET
1,2
REFERENCES
Jørgen Lou, Danish Patent 126840 (27 August 1973).
LINKS
G. L. Sicherman, Catalogue of Polykedges.
EXAMPLE
a(3)=9 because there are 8 ways to join 3 cells in the cubic grid at faces or edges, identifying reflections, and one of those 8 has distinct mirror images, which makes 9.
CROSSREFS
KEYWORD
nonn,nice,more,hard
AUTHOR
George Sicherman, Mar 24 2016
EXTENSIONS
Terms a(8) and a(9) from Joerg Arndt and Márk Péter Légrádi, May 20 2023
STATUS
approved