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A240155
Number of 3Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4
1
4, 11, 20, 107, 186, 450, 1641, 2788, 8018, 23175, 45126, 134673, 357608, 737260, 2166386, 5505921, 11966760, 34560626, 85121623, 194751022, 548083132, 1325791556, 3156785846, 8660504920, 20790818391, 50929828270, 136560783094
OFFSET
1,1
COMMENTS
Row 3 of A240153
LINKS
EXAMPLE
Some solutions for n=4
..2..2..3..2....2..2..3..3....3..3..2..3....2..2..3..2....3..2..3..3
..0..2..1..1....0..2..1..1....2..1..2..1....0..2..1..1....3..2..1..2
..0..0..3..3....2..2..3..2....0..0..3..3....0..0..0..3....2..2..3..3
CROSSREFS
Sequence in context: A240784 A345434 A297961 * A161975 A272042 A301135
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 02 2014
STATUS
approved