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A306178
Number of unrooted self-avoiding walks with n steps that can make turns from the set 0, +-Pi/4, +-Pi/2, +-3*Pi/4.
12
1, 4, 15, 86, 492, 2992
OFFSET
1,2
COMMENTS
The turning angles are those of the regular octagon, with one vertex corresponding to the forbidden U-turn. The path may neither intersect nor touch itself anywhere.
KEYWORD
nonn,walk,more
AUTHOR
Hugo Pfoertner, Jun 23 2018
STATUS
approved