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A221232 Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no occupancy greater than 2 1
4, 852, 54075, 3618339, 245539157, 16783348483, 1149649557942, 78781028973610, 5398115263510454, 369826510764450212, 25333832048380716784, 1735268265292767301022, 118852327360929428638771 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A221234

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..46

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A172893 A072725 A176186 * A272167 A255269 A113896

Adjacent sequences:  A221229 A221230 A221231 * A221233 A221234 A221235

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 05 2013

STATUS

approved

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Last modified November 23 00:33 EST 2017. Contains 295107 sequences.