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A232291 Number of nX4 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally 1
15, 587, 20563, 718483, 25116353, 877968487, 30690409685, 1072818688305, 37501616113029, 1310912294899905, 45824453004106979, 1601846669127816785, 55994400002283842181, 1957348909882095004225, 68421391333068584221039 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A232295

LINKS

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

FORMULA

Empirical: a(n) = 30*a(n-1) +171*a(n-2) +93*a(n-3) -496*a(n-4) -281*a(n-5) +186*a(n-6) +206*a(n-7) -173*a(n-8) +45*a(n-9) -4*a(n-10)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A183546 A179895 A343074 * A294834 A276489 A243227

Adjacent sequences:  A232288 A232289 A232290 * A232292 A232293 A232294

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 22 2013

STATUS

approved

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Last modified October 3 18:24 EDT 2022. Contains 357237 sequences. (Running on oeis4.)