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A183577 Half the number of nX2 0..3 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors 1
2, 14, 78, 407, 2216, 12024, 65277, 354615, 1926386, 10465655, 56858572, 308906899, 1678265791, 9117888439, 49536803509, 269129777690, 1462162196206, 7943819360442, 43158185018445, 234475238671702, 1273886693818638 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A183584

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n)=7*a(n-1)-8*a(n-2)+4*a(n-3)-41*a(n-4)+20*a(n-5)-13*a(n-6)+130*a(n-7)+32*a(n-8)+94*a(n-9)-118*a(n-10)-88*a(n-11)-93*a(n-12)-a(n-13)+20*a(n-14)

EXAMPLE

Some solutions with a(1,1)<=1 for 3X2

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

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

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

CROSSREFS

Sequence in context: A278417 A339240 A133224 * A121200 A112408 A026291

Adjacent sequences: A183574 A183575 A183576 * A183578 A183579 A183580

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 05 2011

STATUS

approved

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Last modified December 8 10:24 EST 2022. Contains 358693 sequences. (Running on oeis4.)