A203493 Number of 3Xn 0..2 arrays with row sums equal and column sums unequal to adjacent columns.

3, 36, 624, 9540, 170868, 3171708, 59683122, 1152091884, 22554305502, 446374660920, 8921216076156, 179685599410440, 3642895093030506, 74273800555695024, 1521731710882139544, 31310362607335978500

Offset: 1

Author

R. H. Hardin Jan 02 2012

Keywords

• nonn

Comments

Row 3 of A203491

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..50