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A336724
Number of n-step self-avoiding walks on the half-Manhattan square lattice.
3
1, 3, 7, 17, 37, 83, 181, 399, 863, 1887, 4057, 8797, 18851, 40649, 86911, 186705, 398413, 853407, 1818099, 3885377, 8266359, 17632961, 37473467, 79814011, 169457991, 360469139, 764700473, 1624915019, 3444615545, 7312733017, 15492242679, 32862908109, 69581860921, 147497088201
OFFSET
0,2
COMMENTS
In the half-Manhattan lattice, E-W streets run alternately E and W, but N-S streets are two way.
LINKS
Sean A. Irvine, Java program (github)
CROSSREFS
Cf. A336705 (coordination sequence), A336742 (self-avoiding cycles), A117633 (Manhattan lattice), A001411 (square lattice), A322419 (L-lattice).
Sequence in context: A033489 A357212 A323583 * A178941 A178155 A330457
KEYWORD
nonn,walk
AUTHOR
Sean A. Irvine, Aug 01 2020
STATUS
approved