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A200796 Number of nX3 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors 1
5, 178, 9880, 583813, 34679839, 2060918000, 122478253815, 7278777317468, 432571571252989, 25707362563355693, 1527766813187552208, 90793889493222901029, 5395804057415427972197, 320668071260622898796015 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A200801

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = 60*a(n-1) -17*a(n-2) -964*a(n-3) -2509*a(n-4) +968*a(n-5) +23125*a(n-6) +31652*a(n-7) -4566*a(n-8) -17118*a(n-9) -29646*a(n-10) -74826*a(n-11) -64125*a(n-12) -13932*a(n-13) +4131*a(n-14) +1458*a(n-15) for n>16

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A111515 A157204 A248383 * A241115 A208196 A194571

Adjacent sequences:  A200793 A200794 A200795 * A200797 A200798 A200799

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 22 2011

STATUS

approved

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Last modified October 19 16:25 EDT 2021. Contains 348091 sequences. (Running on oeis4.)