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A323134
Number of polygons made of uncrossed knight's paths of length 2*n on an infinite board.
4
0, 3, 13, 178, 3031, 64866
OFFSET
1,2
EXAMPLE
See Pfoertner link.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Hugo Pfoertner, Jan 05 2019
STATUS
approved