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

5, 380, 50384, 6907736, 948656912, 130292546801, 17895005957823, 2457786852894234, 337564362706067534, 46362726246946052884, 6367681611531782236418, 874568266109492180669275

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