A038393 Number of 4n-step self-avoiding closed paths on first quadrant grid, passing through origin, symmetric about line y = x.

1, 1, 2, 6, 20, 78, 342, 1608, 7966, 41054, 218342, 1191038, 6635164, 37621952, 216557220, 1262829914, 7447921572

Offset: 0

Author

David W. Wilson

Keywords

• nonn

Crossrefs

Cf. A034010.