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A266888

Number of 4 X n arrays containing n copies of 0..4-1 with no element 1 greater than its north, northeast or northwest neighbor modulo 4 and the upper left element equal to 0.

2, 22, 322, 5826, 116602, 2507350, 56777970, 1336707816, 32440959218, 806165939746, 20420782541546, 525394022266716, 13694383648911264, 360867862158985262, 9598740400829938584, 257384054278121562390

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OFFSET

1,1

COMMENTS

Row 4 of A266886.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..19

EXAMPLE

Some solutions for n=5

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

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

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