A240048 Number of 3Xn 0..3 arrays with no element equal to zero 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 one plus the sum of the elements antidiagonally to its northeast, modulo 4.

4, 10, 26, 72, 174, 597, 1187, 3115, 7269, 16520, 39181, 89951, 210684, 483773, 1131924, 2616441, 6047969, 14112456, 32543109, 75591535, 175328537, 405822918, 941534652, 2181820138, 5057085795, 11720944941, 27171466826, 62973901722

Offset: 1

Author

R. H. Hardin, Mar 31 2014

Keywords

• nonn

Comments

Row 3 of A240046

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..200
• R. H. Hardin, Empirical recurrence of order 76

Formula

Empirical recurrence of order 76 (see link above)