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A198902 Number of nX4 0..4 arrays with values 0..4 introduced in row major order and no element equal to any horizontal or vertical neighbor 2
5, 380, 50384, 6907736, 948656912, 130292546801, 17895005957823, 2457786852894234, 337564362706067534, 46362726246946052884, 6367681611531782236418, 874568266109492180669275 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A198906

LINKS

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

FORMULA

Empirical: a(n) = 163*a(n-1) -3751*a(n-2) +32097*a(n-3) -120287*a(n-4) +201471*a(n-5) -148296*a(n-6) +38604*a(n-7)

EXAMPLE

Some solutions with values 0 to 4 for n=5

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

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

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

..1..0..4..0....2..3..0..4....1..0..2..0....3..1..2..1....3..0..3..4

..2..1..0..2....1..2..4..0....4..3..4..2....4..0..1..3....2..3..0..3

CROSSREFS

Sequence in context: A273397 A261433 A206386 * A100474 A152438 A060506

Adjacent sequences:  A198899 A198900 A198901 * A198903 A198904 A198905

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 31 2011

STATUS

approved

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Last modified August 10 20:21 EDT 2022. Contains 356039 sequences. (Running on oeis4.)