A203492 Number of 2Xn 0..2 arrays with row sums equal and column sums unequal to adjacent columns.

3, 10, 80, 556, 3348, 20596, 134412, 888232, 5836068, 38457456, 255381636, 1704162724, 11399565860, 76433483528, 513785171540, 3461284463632, 23360156262164, 157908381404144, 1068981156413892, 7246198178206132

Offset: 1

Author

R. H. Hardin Jan 02 2012

Keywords

• nonn

Comments

Row 2 of A203491

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..97