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A198663 Number of nX2 0..4 arrays with values 0..4 introduced in row major order and each element equal to one or two horizontal and vertical neighbors 1
1, 3, 13, 65, 401, 2798, 21243, 170477, 1414186, 11959573, 102256003, 879709138, 7594221063, 65683697809, 568711886538, 4926993076641, 42698505718759, 370102007685234, 3208288130917763, 27813084430989669, 241122723310051914 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A198669

LINKS

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

FORMULA

Empirical: a(n) = 12*a(n-1) -18*a(n-2) -96*a(n-3) -43*a(n-4) +384*a(n-5) +1030*a(n-6) +276*a(n-7) -1609*a(n-8) -3144*a(n-9) -1688*a(n-10) +1080*a(n-11) +1536*a(n-12) +768*a(n-13) -512*a(n-14) for n>16

EXAMPLE

Some solutions with all values 0 to 4 for n=6

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

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

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

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

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

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

CROSSREFS

Sequence in context: A080227 A199143 A002468 * A156181 A260783 A228987

Adjacent sequences:  A198660 A198661 A198662 * A198664 A198665 A198666

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 28 2011

STATUS

approved

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Last modified August 4 15:53 EDT 2021. Contains 346447 sequences. (Running on oeis4.)