A208198 Number of nX5 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors.

51, 41272, 39725054, 38372808893, 37069738362057, 35810971705853725, 34594950233928279876, 33420220819293699707599, 32285381308444124871905667, 31189077171790298063795540459, 30129999876244591484571731949842

Offset: 1

Author

R. H. Hardin Feb 24 2012

Keywords

• nonn

Comments

Column 5 of A208201

Examples

			Some solutions for n=4
..0..0..0..1..0....0..0..0..0..0....0..1..0..0..0....0..1..1..0..0
..0..1..1..0..2....0..1..0..2..0....1..0..0..1..0....0..2..0..0..2
..2..1..2..2..2....1..0..2..0..1....1..0..2..3..1....1..1..3..1..0
..0..1..3..1..3....2..1..3..0..0....3..2..2..1..1....0..1..0..2..3
		

Links

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

Formula

Empirical: a(n) = 928*a(n-1) +38247*a(n-2) -1419908*a(n-3) -25003347*a(n-4) [phone]*a(n-5) -9450054156*a(n-6) [phone]*a(n-7) [phone]*a(n-8) -489140400628*a(n-9) [phone]*a(n-10) [phone]*a(n-11) -3331507779798*a(n-12) [phone]*a(n-13) [phone]*a(n-14) -977046212844*a(n-15) -462110735853*a(n-16) [phone]*a(n-17) [phone]*a(n-18) -7270112880*a(n-19) for n>20