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A221248 Number of 4 X n arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor. 0
0, 441, 21660, 4096576, 438377904, 56606878084, 6757282699788, 830820670081600, 100904384322992160 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A221245.

LINKS

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

EXAMPLE

Some solutions for n=3

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

..1..1..1....0..2..1....1..4..0....2..6..0....0..2..1....0..5..0....2..3..1

..0..5..0....1..0..1....1..4..0....1..2..0....1..1..0....0..1..0....1..1..0

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

CROSSREFS

Cf. A221245.

Sequence in context: A206467 A264262 A232003 * A220680 A189278 A151656

Adjacent sequences: A221245 A221246 A221247 * A221249 A221250 A221251

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2013

STATUS

approved

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Last modified February 2 17:16 EST 2023. Contains 360023 sequences. (Running on oeis4.)