A007720 Arises in attempts to apply Engel's `probabilistic abacus' to random walks on infinite square grid.

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

Offset

1,2

Links

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

Crossrefs

Sequence in context: A338482 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