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A221353
Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without 2-loops
0
0, 7, 370, 12296, 364868, 10612940, 304064432, 8672312531, 246687608692, 7009800248655, 199081627533706, 5652690459992416, 160483388497482942, 4555988975443640203
OFFSET
1,2
COMMENTS
Row 3 of A221351
EXAMPLE
Some solutions for n=3
..0..3..0....0..3..0....0..0..0....0..1..0....0..2..0....0..0..0....1..3..0
..2..1..1....2..1..0....2..5..1....1..3..1....2..2..0....1..3..2....1..3..1
..0..2..0....0..2..1....0..1..0....0..2..1....1..2..0....0..3..0....0..0..0
CROSSREFS
Sequence in context: A057634 A203706 A145181 * A222870 A270247 A270228
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 11 2013
STATUS
approved