A198978 Number of nX4 0..5 arrays with values 0..5 introduced in row major order and no element equal to any horizontal or vertical neighbor.

5, 481, 146286, 53082012, 19622872903, 7267830860056, 2692353648978984, 997397244990907738, 369492074075459555844, 136880688981914387733120, 50708322978926251631508008, 18785221234054066344117511329

Offset: 1

Author

R. H. Hardin Nov 01 2011

Keywords

• nonn

Comments

Column 4 of A198982

Examples

			Some solutions with all values from 0 to 5 for n=5
..0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1
..1..0..1..0....1..0..1..0....1..0..1..0....1..0..1..0....1..0..1..0
..2..3..0..1....2..3..0..1....2..3..0..1....2..3..0..1....2..1..0..3
..0..4..3..5....0..1..4..3....4..1..5..3....4..5..4..3....0..3..4..2
..1..5..2..1....4..5..3..1....5..3..4..0....3..4..5..0....5..2..3..0
		

Links

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

Formula

Empirical: a(n) = 454*a(n-1) -33435*a(n-2) +955655*a(n-3) -13146749*a(n-4) [phone]*a(n-5) -373512375*a(n-6) [phone]*a(n-7) -866661210*a(n-8) [phone]*a(n-9) -102202326*a(n-10)