A208255 Number of nX5 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors.

41, 6144, 920928, 137947632, 20662697664, 3094987890864, 463586569433280, 69438884409258336, 10400988693344761104, 1557924881981189122032, 233355694295516814615312, 34953469637696859885114528

Offset: 1

Author

R. H. Hardin Feb 24 2012

Keywords

• nonn

Comments

Column 5 of A208258

Examples

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

Links

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

Formula

Empirical: a(n) = 171*a(n-1) -3370*a(n-2) +29805*a(n-3) -149108*a(n-4) +447784*a(n-5) -778496*a(n-6) +649216*a(n-7) -114688*a(n-8) for n>9