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A221403 Number of 4 X n arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2. 0
0, 38, 144, 89173, 2294372, 247200529, 10874636860, 776880319370, 41186123651894, 2584866896797503, 146335664855961366 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A221400.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A158525 A044370 A044751 * A320309 A164093 A158064

Adjacent sequences:  A221400 A221401 A221402 * A221404 A221405 A221406

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 15 2013

STATUS

approved

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Last modified June 24 21:50 EDT 2021. Contains 345433 sequences. (Running on oeis4.)