A203026 Number of nX2 0..3 arrays with row sums equal and column sums unequal to adjacent columns

12, 28, 120, 356, 1472, 4780, 20228, 68724, 296256, 1034008, 4501388, 15995228, 69888012, 251506724, 1098929960, 3991711796, 17408141792, 63681484600, 276945484748, 1018750420536, 4416760710356, 16320495059248, 70538020856288

Offset

1,1

Comments

Column 2 of A203031

Links

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

Example

Some.solutions.for.n=5
..3..0....3..0....2..2....3..0....0..1....3..2....3..0....1..2....0..1....1..0
..1..2....3..0....1..3....1..2....1..0....2..3....2..1....2..1....0..1....0..1
..3..0....3..0....1..3....1..2....1..0....3..2....3..0....3..0....1..0....0..1
..0..3....0..3....1..3....3..0....0..1....2..3....2..1....3..0....0..1....1..0
..2..1....2..1....2..2....1..2....0..1....2..3....3..0....0..3....0..1....0..1

Crossrefs

Sequence in context: A078441 A351104 A340685 * A377944 A189539 A000546

Adjacent sequences: A203023 A203024 A203025 * A203027 A203028 A203029

Keyword

nonn

Author

R. H. Hardin Dec 27 2011

Status

approved