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A229376 Number of nX4 0..2 arrays avoiding 11 horizontally, 22 vertically and 00 diagonally or antidiagonally 1
60, 518, 6730, 78690, 956866, 11441370, 138118032, 1657198220, 19969628086, 239888727922, 2888372417962, 34717775838484, 417835837510270, 5023955278338394, 60449751205860716, 726964181424486002 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A229380

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) +150*a(n-2) -614*a(n-3) -6021*a(n-4) +20473*a(n-5) +101559*a(n-6) -313078*a(n-7) -812145*a(n-8) +2419449*a(n-9) +3153273*a(n-10) -9572428*a(n-11) -6094709*a(n-12) +19880682*a(n-13) +5584682*a(n-14) -21686564*a(n-15) -1854284*a(n-16) +12002158*a(n-17) -190196*a(n-18) -3154524*a(n-19) +224356*a(n-20) +344336*a(n-21) -35568*a(n-22) -12480*a(n-23) +1536*a(n-24) for n>25

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A341597 A334306 A069140 * A298684 A316458 A184191

Adjacent sequences:  A229373 A229374 A229375 * A229377 A229378 A229379

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 21 2013

STATUS

approved

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Last modified January 18 11:57 EST 2022. Contains 350455 sequences. (Running on oeis4.)