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

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

R. H. Hardin, Table of n, a(n) for n = 1..184

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

Adjacent sequences: A240152 A240153 A240154 * A240156 A240157 A240158

Keyword

nonn

Author

R. H. Hardin, Apr 02 2014

Status

approved