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A217021 Number of city-block distance 1, pressure limit 2 movements in an n X n array with each element moving exactly one horizontally or vertically and no element acquiring more than two neighbors 0
0, 16, 3456, 12931216, 655816458528, 473216230511351044, 4822507485300347026181088, 695298786420085228281048744405924, 1417923660297801516897331705897083237291008 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A217028

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

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

..2..1..3....2..3..3....1..2..3....2..3..2....1..3..2....1..1..2....1..2..3

..2..3..0....1..1..3....2..1..0....2..1..0....2..3..2....2..2..3....2..3..0

..1..0..3....1..3..3....1..1..3....0..1..3....0..1..3....0..0..3....0..0..0

CROSSREFS

Sequence in context: A249599 A281821 A003773 * A087519 A222917 A060616

Adjacent sequences:  A217018 A217019 A217020 * A217022 A217023 A217024

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 24 2012

STATUS

approved

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Last modified February 17 12:10 EST 2019. Contains 320219 sequences. (Running on oeis4.)