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URL: https://oeis.org/A217026

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A217026
Number of city-block distance 1, pressure limit 2 movements in an nX6 array with each element moving exactly one horizontally or vertically and no element acquiring more than two neighbors.
1
16, 70225, 103754596, 174892912804, 287247245656900, 473216230511351044, 778956312256094880625, 1282337355733724881761856, 2110951958198074542626828769, 3475005538598697157658237172049
OFFSET
1,1
COMMENTS
Column 6 of A217028
LINKS
EXAMPLE
Some solutions for n=2 (movement: 0=n 1=e 2=s 3=w)
..2..3..2..3..1..3....1..2..2..3..3..3....2..2..1..3..3..2....2..3..2..2..2..3
..0..1..1..1..1..0....0..0..3..3..0..3....0..3..0..1..1..3....0..0..0..1..0..0
CROSSREFS
Sequence in context: A105312 A013758 A078186 * A393865 A087926 A193135
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 24 2012
STATUS
approved