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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 31 2011
STATUS
approved

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Last modified May 26 23:01 EDT 2024. Contains 372847 sequences. (Running on oeis4.)