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A320421
Number of closed self-avoiding paths on square lattice with 2*n steps, A010566(n)/8.
0
0, 1, 3, 14, 70, 372, 2058, 11752, 68706, 409130, 2472646, 15127620, 93504944, 583032968, 3662883960, 23163461280, 147329432094, 941880843108, 6049001532148, 39007700026460, 252477751201074, 1639657957610596, 10680997864879592, 69772819359471480, 456959583009324200
OFFSET
1,3
COMMENTS
Rotations and reflections of the path are counted only once, but see A266549 for further elimination of path isomorphisms.
REFERENCES
See A010566.
CROSSREFS
KEYWORD
nonn,walk
AUTHOR
Hugo Pfoertner, Jan 08 2019
STATUS
approved