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A217951 Number of n element 0..3 arrays with each element the minimum of 5 adjacent elements of a random 0..3 array of n+4 elements 1
4, 16, 50, 130, 296, 610, 1177, 2209, 4202, 8366, 17569, 38251, 84134, 183334, 392284, 824110, 1708779, 3523509, 7276452, 15117730, 31635969, 66571659, 140445543, 296202061, 623355780, 1308333724, 2740013491, 5731815041, 11989696656 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 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-6) -4*a(n-7) +6*a(n-8) +4*a(n-9) +5*a(n-10) +6*a(n-11) +2*a(n-12) +4*a(n-13) +3*a(n-14) +2*a(n-15) +a(n-16)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A223659 A217953 A217952 * A217950 A217949 A227675

Adjacent sequences:  A217948 A217949 A217950 * A217952 A217953 A217954

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 15 2012

STATUS

approved

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Last modified April 13 10:24 EDT 2021. Contains 342935 sequences. (Running on oeis4.)