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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 (list; graph; refs; listen; history; text; internal format)
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.

LINKS

Table of n, a(n) for n=1..25.

CROSSREFS

Cf. A002931, A010566, A266549.

Sequence in context: A001579 A327871 A006772 * A009020 A186765 A109792

Adjacent sequences:  A320418 A320419 A320420 * A320422 A320423 A320424

KEYWORD

nonn,walk

AUTHOR

Hugo Pfoertner, Jan 08 2019

STATUS

approved

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Last modified January 26 17:14 EST 2020. Contains 331280 sequences. (Running on oeis4.)