A239332 Number of n X n 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of the elements above it, modulo 4.

2, 31, 2187, 790681, 1527488498, 15397080750829, 808844678734652790, 222534953338562308679099, 320707048341323698139814420023

Offset: 1

Author

R. H. Hardin, Mar 16 2014

Keywords

• nonn

Comments

Diagonal of A239340

Examples

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