A232330 Number of n X n 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally, with no adjacent elements equal.

1, 6, 74, 734, 38986, 1047700, 318521414, 21383016966, 41587044818288, 6504751614236146, 87397564422467956534, 30467813258936981061662, 2950963661663407494064125726, 2230955943109246024221388092190

Offset: 1

Author

R. H. Hardin, Nov 22 2013

Keywords

• nonn

Comments

Diagonal of A232335

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..16