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A306179
Number of unrooted self-avoiding walks with n steps that can make turns from the set +-Pi/9, +-3*Pi/9, +-5*Pi/9, +-7*Pi/9.
10
1, 4, 19, 128, 861, 6051
OFFSET
1,2
COMMENTS
The turning angles are those of the regular nonagon, 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