A219981 - OEIS

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A219981

Unmatched value maps: number of nX4 binary arrays indicating the locations of corresponding elements not equal to any horizontal, vertical or antidiagonal neighbor in a random 0..3 nX4 array

7, 154, 2344, 34212, 507655, 7542829, 111990804, 1662706049, 24686644236, 366529445423, 5441957364383, 80798147898113, 1199631049503365, 17811233176117311, 264447995737166473, 3926327939543345163

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

OFFSET

1,1

COMMENTS

Column 4 of A219985

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..74

FORMULA

Empirical: a(n) = 16*a(n-1) -34*a(n-2) +277*a(n-3) -479*a(n-4) +1450*a(n-5) -2148*a(n-6) +1689*a(n-7) +1083*a(n-8) -5544*a(n-9) +5188*a(n-10) +768*a(n-11) -4869*a(n-12) +2792*a(n-13) +402*a(n-14) -720*a(n-15) +41*a(n-16) +129*a(n-17) -50*a(n-18) +14*a(n-19) -5*a(n-20) +a(n-21)

EXAMPLE

Some solutions for n=3

..1..1..1..0....1..0..1..1....1..1..1..1....1..1..1..1....0..0..1..1

..0..1..0..0....0..0..1..0....0..0..0..0....1..0..0..0....0..0..0..0

..0..0..0..0....0..0..0..0....1..0..1..1....1..1..1..0....1..1..0..1

CROSSREFS

Sequence in context: A317066 A213798 A219102 * A213113 A144683 A229711

Adjacent sequences: A219978 A219979 A219980 * A219982 A219983 A219984

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 02 2012

STATUS

approved