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A221430
Number of nX2 arrays of occupancy after each element moves to some king-move neighbor, without consecutive moves in the same direction
1
1, 31, 286, 3295, 34477, 371116, 3952193, 42233189, 450737852, 4812507367, 51375286141, 548476573106, 5855368833337, 62510491196149, 667345378826444, 7124406585458739, 76058302324451277, 811978618013721140
OFFSET
1,2
COMMENTS
Column 2 of A221432
LINKS
FORMULA
Empirical: a(n) = 13*a(n-1) -13*a(n-2) -151*a(n-3) +286*a(n-4) -287*a(n-5) +833*a(n-6) -966*a(n-7) +488*a(n-8) +39*a(n-9) -63*a(n-10) +26*a(n-11) -2*a(n-12)
EXAMPLE
Some solutions for n=3
..2..1....0..2....1..0....0..1....2..2....0..2....1..0....1..1....0..1....2..0
..1..0....0..2....1..1....3..0....1..1....4..0....2..0....3..0....5..0....2..1
..2..0....2..0....2..1....0..2....0..0....0..0....0..3....1..0....0..0....1..0
CROSSREFS
Sequence in context: A161558 A336279 A156094 * A115151 A327561 A279980
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 16 2013
STATUS
approved