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A252957 Number of (n+2)X(4+2) 0..4 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order 1
603, 249, 369, 674, 1242, 2201, 4275, 8202, 15026, 29799, 58371, 108338, 217140, 428327, 803859, 1614920, 3205212, 6055415, 12197421, 24269712, 46190180, 93054741, 185677773, 355292744, 716230710, 1430822693, 2753038317, 5547393902 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A252961

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 5*a(n-1) -6*a(n-2) +5*a(n-3) -40*a(n-4) +57*a(n-5) +67*a(n-6) -110*a(n-7) +15*a(n-8) -415*a(n-9) +1040*a(n-10) -861*a(n-11) +314*a(n-12) -175*a(n-13) +147*a(n-14) -42*a(n-15) for n>17

EXAMPLE

Some solutions for n=2

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

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

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

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

CROSSREFS

Sequence in context: A218180 A218521 A145331 * A348077 A066785 A178032

Adjacent sequences:  A252954 A252955 A252956 * A252958 A252959 A252960

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 25 2014

STATUS

approved

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Last modified October 17 13:20 EDT 2021. Contains 348049 sequences. (Running on oeis4.)