A217952 - OEIS

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A217952

Number of n element 0..3 arrays with each element the minimum of 6 adjacent elements of a random 0..3 array of n+5 elements

4, 16, 50, 130, 296, 610, 1163, 2097, 3670, 6434, 11666, 22313, 44907, 93206, 194831, 403141, 818641, 1628770, 3184993, 6157786, 11854873, 22877202, 44459405, 87168326, 172249773, 342083954, 680463827, 1351826291, 2677343192, 5283369867

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

OFFSET

1,1

COMMENTS

Column 6 of A217954

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4) +6*a(n-7) -4*a(n-8) +6*a(n-9) +4*a(n-10) +5*a(n-11) +6*a(n-12) +7*a(n-13) +3*a(n-14) +5*a(n-15) +4*a(n-16) +3*a(n-17) +2*a(n-18) +a(n-19)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A271483 A223659 A217953 * A217951 A217950 A217949

Adjacent sequences: A217949 A217950 A217951 * A217953 A217954 A217955

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 15 2012

STATUS

approved