A268178 Number of nX3 0..3 arrays with every repeated value in every row equal to, and in every column unequal to, the previous repeated value, and new values introduced in row-major sequential order.

5, 187, 9054, 494098, 25770278, 1339895662, 68390077014, 3463876525750, 173821913942582, 8669861062288198, 430055421776241462, 21243060963214339750, 1045628843830767904502, 51323318125992835472806

Offset: 1

Author

R. H. Hardin, Jan 28 2016

Keywords

• nonn

Comments

Column 3 of A268180.

Examples

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

Links

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

Crossrefs

Cf. A268180.

Formula

Empirical: a(n) = 108*a(n-1) -2343*a(n-2) -95508*a(n-3) +3418760*a(n-4) [phone]*a(n-5) -1342943052*a(n-6) -883192104*a(n-7) [phone]*a(n-8) -342228942720*a(n-9) -5613350923584*a(n-10) [phone]*a(n-11) [phone]*a(n-12) -69629468894208*a(n-13) -198751111188480*a(n-14) [phone]*a(n-15) [phone]*a(n-16) -228509902503936*a(n-17) for n>19