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A220106 Number of nX1 arrays of the minimum or maximum value of corresponding elements and their horizontal and vertical neighbors in a random 0..3 nX1 array 1
4, 16, 56, 250, 984, 3888, 15798, 63092, 252064, 1010554, 4040556, 16155482, 64620946, 258358476, 1032891644, 4129483594, 16508060352, 65991303276, 263798841494, 1054506124776, 4215228829600, 16849633947562, 67352986553090 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A220109

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 4*a(n-1) +2*a(n-2) +3*a(n-3) -32*a(n-4) -34*a(n-5) -23*a(n-6) -158*a(n-7) +295*a(n-9) +42*a(n-10) -65*a(n-11) +12*a(n-12) -44*a(n-13) +2*a(n-14) +24*a(n-15)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A290908 A201619 A197532 * A281064 A122032 A197674

Adjacent sequences:  A220103 A220104 A220105 * A220107 A220108 A220109

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 05 2012

STATUS

approved

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Last modified January 17 14:27 EST 2022. Contains 350400 sequences. (Running on oeis4.)