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A217953
Number of n element 0..3 arrays with each element the minimum of 7 adjacent elements of a random 0..3 array of n+6 elements
1
4, 16, 50, 130, 296, 610, 1163, 2083, 3558, 5902, 9734, 16410, 28969, 54049, 105529, 211097, 423650, 840654, 1636964, 3121556, 5839194, 10760322, 19647966, 35780070, 65376302, 120393728, 223926347, 420463887, 795087960, 1508967508, 2864523898
OFFSET
1,1
COMMENTS
Column 7 of A217954
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4) +6*a(n-8) -4*a(n-9) +6*a(n-10) +4*a(n-11) +5*a(n-12) +6*a(n-13) +7*a(n-14) +8*a(n-15) +4*a(n-16) +6*a(n-17) +5*a(n-18) +4*a(n-19) +3*a(n-20) +2*a(n-21) +a(n-22)
EXAMPLE
Some solutions for n=4
..3....2....0....3....1....0....1....1....1....0....1....0....1....0....1....3
..2....2....3....1....3....1....1....1....3....1....2....3....3....2....2....3
..1....2....2....0....2....2....0....3....2....2....3....2....0....3....1....3
..1....1....1....0....2....2....0....3....1....0....3....2....0....3....1....3
CROSSREFS
Sequence in context: A231156 A271483 A223659 * A217952 A217951 A217950
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 15 2012
STATUS
approved