A198903 Number of n X 5 0..4 arrays with values 0..4 introduced in row major order and no element equal to any horizontal or vertical neighbor.

15, 4801, 2125425, 948656912, 423503301834, 189062985604305, 84402688527136201, 37679579867128064832, 16821155393975907014458, 7509406150309683843851949, 3352396396661126098060061297

Offset: 1

Author

R. H. Hardin Oct 31 2011

Keywords

• nonn

Comments

Column 5 of A198906.

Examples

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

Links

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

Crossrefs

Cf. A198906.

Formula

Empirical: a(n) = 559*a(n-1) -54943*a(n-2) +2182857*a(n-3) -41132051*a(n-4) [phone]*a(n-5) -519526889*a(n-6) -11351340633*a(n-7) [phone]*a(n-8) -227367989480*a(n-9) [phone]*a(n-10) -247117199296*a(n-11) [phone]*a(n-12) -11964372480*a(n-13).