OFFSET
0,2
COMMENTS
The chains are counted up to congruence.
Let ABC be a lattice triangle in an n X n grid. If ABC is scalene, then the pairs (BA,AC), (AB,BC), and (AC, CB) form three inequivalent polygonal chains; likewise, if ABC is isosceles and AB is the base of the triangle, then (BA,AC) and (AC,CB) form two distinct polygonal chains, while (BC,CA) is congruent to (AB,BC).
LINKS
Alec Jones, Examples for n = 1 to 2
CROSSREFS
KEYWORD
nonn
AUTHOR
Alec Jones, Apr 18 2016
STATUS
approved