A239811 Number of n X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it, modulo 4.

2, 23, 1480, 510748, 884977259, 8243207656791, 399696014140196630, 102140919909434198721245, 136329092264192919129397551406

Offset: 1

Author

R. H. Hardin, Mar 27 2014

Keywords

• nonn

Comments

Diagonal of A239819

Examples

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