A239538 Number of (4+1)X(n+1) 0..2 arrays with no element equal to all horizontal neighbors or unequal to all vertical neighbors, and new values 0..2 introduced in row major order.

13, 68, 1014, 11108, 131988, 1533792, 17931608, 209295248, 2443954640, 28534764096, 333172950560, 3890104752256, 45420709489664, 530330059963392, 6192109859155200, 72298791884174336, 844157402919585408

Offset: 1

Author

R. H. Hardin, Mar 21 2014

Keywords

• nonn

Comments

Row 4 of A239537

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 8*a(n-1) +46*a(n-2) -22*a(n-3) -166*a(n-4) +28*a(n-5) +68*a(n-6) +208*a(n-7) -160*a(n-8) -48*a(n-9) +32*a(n-10)