A240761 Number of 2Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

2, 6, 9, 42, 124, 474, 1440, 5239, 16730, 58945, 192711, 666682, 2209028, 7562090, 25254050, 85922148, 288250557, 977287148, 3287088851, 11122488393, 37465304475, 126628657804, 426895509278, 1441942470916, 4863435928395

Offset: 1

Author

R. H. Hardin, Apr 12 2014

Keywords

• nonn

Comments

Row 2 of A240760

Examples

			Some solutions for n=4
..3..1..3..3....2..2..2..2....2..2..3..3....2..2..2..2....3..3..2..3
..2..2..2..1....3..1..0..3....3..1..0..2....3..3..1..3....2..0..0..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..84