A208256 Number of nX6 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.

122, 49152, 19566912, 7782199824, 3094987890864, 1230875651548608, 489518751475118880, 194681408759751734640, 77424717204435400421520, 30791778589670316720418080, 12245877840416847143166208896

Offset: 1

Author

R. H. Hardin Feb 24 2012

Keywords

• nonn

Comments

Column 6 of A208258

Examples

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

Links

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

Formula

Empirical: a(n) = 483*a(n-1) -37260*a(n-2) +1406078*a(n-3) -32825379*a(n-4) [phone]*a(n-5) -5935275892*a(n-6) [phone]*a(n-7) -292045494268*a(n-8) [phone]*a(n-9) -3438890819616*a(n-10) [phone]*a(n-11) -4538037229568*a(n-12) [phone]*a(n-13) [phone]*a(n-14) -1133951057920*a(n-15) [phone]*a(n-16) -52613349376*a(n-17) for n>18