A208396 Number of 5Xn 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.

41, 9842, 2056392, 438083928, 93120350760, 19798894881900, 4209452449879284, 894976200467603100, 190281795998287100868, 40456006404952930502220, 8601392693737014451368372, 1828750854693797651745630540

Offset: 1

Author

R. H. Hardin Feb 25 2012

Keywords

• nonn

Comments

Row 5 of A208392

Examples

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

Links

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

Formula

Empirical: a(n) = 171*a(n-1) +8504*a(n-2) +77860*a(n-3) -1000900*a(n-4) -11005932*a(n-5) [phone]*a(n-6) [phone]*a(n-7) -3897108352*a(n-8) [phone]*a(n-9) -6449426432*a(n-10) -6696632320*a(n-11) [phone]*a(n-12) [phone]*a(n-13) -2092433408*a(n-14) -484442112*a(n-15) for n>18