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A259855
Bridging trails on square lattice.
0
1, 3, 7, 17, 41, 101, 259, 669, 1731, 4499, 11705, 30623, 80443, 211851, 558999, 1477983, 3914393, 10384023, 27585099, 73366563, 195341557, 520640553
OFFSET
1,2
LINKS
A. J. Guttmann, Lattice trails II: numerical results, J. Phys. A 22 (1989), 575-588.
CROSSREFS
Sequence in context: A089742 A187258 A131721 * A058351 A244782 A175094
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Jul 07 2015
STATUS
approved