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

Table of n, a(n) for n=0..33.

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

Adjacent sequences: A336721 A336722 A336723 * A336725 A336726 A336727

KEYWORD

nonn,walk

AUTHOR

Sean A. Irvine, Aug 01 2020

STATUS

approved

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Last modified January 26 22:13 EST 2023. Contains 359836 sequences. (Running on oeis4.)