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A217450 Number of n X 1 arrays of the minimum value of corresponding elements and their horizontal and vertical neighbors in a random 0..2 n X 1 array. 5
3, 3, 9, 17, 37, 77, 163, 343, 723, 1523, 3209, 6761, 14245, 30013, 63235, 133231, 280707, 591427, 1246089, 2625409, 5531525, 11654477, 24555043, 51735495, 109002515, 229659507, 483874057, 1019483609, 2147969733, 4525598973 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A217457.
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) + a(n-4).
Empirical g.f.: x*(3 - 3*x + 3*x^2 - x^3) / (1 - 2*x - x^4). - Colin Barker, Feb 19 2018
EXAMPLE
All solutions for n=3:
..1....2....0....2....1....2....0....1....0
..0....0....0....2....1....1....0....1....0
..0....0....2....2....1....1....1....2....0
CROSSREFS
Sequence in context: A285883 A232948 A241357 * A089892 A038221 A099465
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 03 2012
STATUS
approved

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Last modified April 13 15:44 EDT 2024. Contains 371644 sequences. (Running on oeis4.)