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A046170 Number of self-avoiding walks on a 2-D lattice of length n which start at the origin, take first step in the {+1,0} direction and whose vertices are always nonnegative in x and y. 3
1, 2, 5, 12, 30, 73, 183, 456, 1151, 2900, 7361, 18684, 47652, 121584, 311259, 797311, 2047384, 5260692, 13542718, 34884239, 89991344, 232282110, 600281932, 1552096361, 4017128206, 10401997092, 26957667445, 69892976538 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..28.

Stephen A. Silver, C program

Eric Weisstein's World of Mathematics, Self-Avoiding Walk

CROSSREFS

Cf. A046171.

Sequence in context: A101911 A052109 A157748 * A262320 A062423 A118649

Adjacent sequences:  A046167 A046168 A046169 * A046171 A046172 A046173

KEYWORD

nonn,walk

AUTHOR

Eric W. Weisstein

EXTENSIONS

More terms from Stephen A. Silver.

STATUS

approved

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Last modified February 18 19:54 EST 2019. Contains 320262 sequences. (Running on oeis4.)