A203487 Number of nX4 0..2 arrays with row sums equal and column sums unequal to adjacent columns.

24, 556, 9540, 173860, 3065704, 56438584, 1004305424, 18465834580, 335571341040, 6219202151476, 114039550489064, 2121345108007408, 39325546973748384, 735898709559550484, 13729000925046178840, 257888578347427756340

Offset: 1

Author

R. H. Hardin Jan 02 2012

Keywords

• nonn

Comments

Column 4 of A203491

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..31