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A240889 Number of nX4 0..2 arrays with no element equal to a different number of vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order 1
4, 36, 289, 2362, 19065, 154858, 1255585, 10186158, 82615013, 670126562, 5435464261, 44088312610, 357608156789, 2900631278142, 23527575671521, 190836751334954, 1547913820098569, 12555429390762018, 101839521640750945 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A240893

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +9*a(n-2) -63*a(n-3) +36*a(n-4) -405*a(n-5) -608*a(n-6) +600*a(n-7) +424*a(n-8) +4600*a(n-9) +10176*a(n-10) +9216*a(n-11) -2560*a(n-12) -29312*a(n-13) -40448*a(n-14) -30720*a(n-15) -16384*a(n-16)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A180170 A277174 A059416 * A108019 A241104 A222428

Adjacent sequences:  A240886 A240887 A240888 * A240890 A240891 A240892

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 14 2014

STATUS

approved

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Last modified December 2 09:28 EST 2021. Contains 349437 sequences. (Running on oeis4.)