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A307391
a(n) is the number of canonical polygons with 4n edges containing only right angles.
8
2, 0, 2, 2, 8, 14, 62, 196, 892, 3788, 18098, 86302, 427340, 2136248
OFFSET
1,1
COMMENTS
It appears that for the same sequence of angles there is one solution with all straight edges and one with all diagonal edges, so all terms are even.
KEYWORD
nonn,more
AUTHOR
Lars Blomberg, Apr 18 2019
STATUS
approved