A217027 Number of city-block distance 1, pressure limit 2 movements in an n X 7 array with each element moving exactly one horizontally or vertically and no element acquiring more than two neighbors.

32, 582169, 3204762800, 20353081850721, 125713947023634648, 778956312256094880625, 4822507485300347026181088, 29858576021672030963854627216, 184863554752897403429583645987340

Offset

1,1

Comments

Column 7 of A217028.

Links

R. H. Hardin, Table of n, a(n) for n = 1..201

Example

Some solutions for n=2 (movement: 0=n 1=e 2=s 3=w)
..2..2..1..1..2..2..2....2..2..2..2..3..1..2....2..2..2..3..3..1..3
..0..0..3..0..3..3..0....1..3..1..0..0..0..3....1..0..1..1..1..3..3

Crossrefs

Cf. A217028.

Sequence in context: A017417 A286179 A017549 * A393876 A087927 A357566

Adjacent sequences: A217024 A217025 A217026 * A217028 A217029 A217030

Keyword

nonn

Author

R. H. Hardin, Sep 24 2012

Status

approved