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A221359 Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2 1
0, 292, 18738, 1388784, 93433746, 6308646549, 423812250312, 28479671473807, 1913505400121105, 128574419200721801, 8639424408948675486, 580522160326792409378, 39007927353168721454490, 2621116666944612733670859 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A221361

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..50

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A221480 A231650 A249239 * A248454 A221832 A238321

Adjacent sequences:  A221356 A221357 A221358 * A221360 A221361 A221362

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 12 2013

STATUS

approved

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Last modified October 18 01:39 EDT 2021. Contains 348065 sequences. (Running on oeis4.)