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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A221432

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..26

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: A008386 A161558 A156094 * A115151 A279980 A001298

Adjacent sequences:  A221427 A221428 A221429 * A221431 A221432 A221433

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 16 2013

STATUS

approved

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Last modified January 22 09:52 EST 2019. Contains 319363 sequences. (Running on oeis4.)