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A007825 Number of n step self-avoiding walks on 3 X infinity grid starting from (0,1). 3
1, 4, 10, 22, 42, 90, 182, 382, 742, 1486, 2866, 5646, 10878, 21198, 40694, 78758, 151018, 291046, 557746, 1072050, 2053586, 3941038, 7547726, 14471102, 27711106, 53099670, 101675030, 194762778, 372916642, 714195242 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Sean A. Irvine, Table of n, a(n) for n = 0..39

CROSSREFS

Cf. A302408 (starting from (0,0)), A038577, A001411.

Sequence in context: A284870 A032191 A065568 * A008256 A006001 A034357

Adjacent sequences:  A007822 A007823 A007824 * A007826 A007827 A007828

KEYWORD

nonn,walk

AUTHOR

Lauren Williams (lwilliam(AT)MIT.EDU)

EXTENSIONS

Title improved and more terms from Sean A. Irvine, Feb 02 2018

STATUS

approved

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Last modified August 21 18:38 EDT 2019. Contains 326168 sequences. (Running on oeis4.)