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A007720 Arises in attempts to apply Engel's `probabilistic abacus' to random walks on infinite square grid. 0
1, 2, 3, 1, 2, 3, 4, 2, 3, 3, 2, 3, 4, 4, 4, 3, 4, 5, 5, 3, 4, 5, 3, 4, 5, 5, 6, 4, 5, 6, 4, 5, 5, 6, 7, 5, 5, 6, 4, 5, 4, 5, 5, 5, 4, 4, 5, 6, 6, 5, 5, 5, 4, 5, 6, 6, 6, 4, 5, 4, 5, 5, 7, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..64.

CROSSREFS

Sequence in context: A264031 A104246 A281367 * A129968 A027615 A053737

Adjacent sequences:  A007717 A007718 A007719 * A007721 A007722 A007723

KEYWORD

nonn,walk

AUTHOR

N. J. A. Sloane, James Propp

STATUS

approved

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Last modified November 19 06:03 EST 2019. Contains 329310 sequences. (Running on oeis4.)