login
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.
2
5, 187, 9054, 494098, 25770278, 1339895662, 68390077014, 3463876525750, 173821913942582, 8669861062288198, 430055421776241462, 21243060963214339750, 1045628843830767904502, 51323318125992835472806
OFFSET
1,1
COMMENTS
Column 3 of A268180.
LINKS
FORMULA
Empirical: a(n) = 108*a(n-1) -2343*a(n-2) -95508*a(n-3) +3418760*a(n-4) +23547420*a(n-5) -1342943052*a(n-6) -883192104*a(n-7) +173217160160*a(n-8) -342228942720*a(n-9) -5613350923584*a(n-10) +8457106112640*a(n-11) +55966350739968*a(n-12) -69629468894208*a(n-13) -198751111188480*a(n-14) +222436679786496*a(n-15) +215814907920384*a(n-16) -228509902503936*a(n-17) for n>19
EXAMPLE
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
CROSSREFS
Cf. A268180.
Sequence in context: A094081 A189645 A228694 * A208410 A268001 A096543
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 28 2016
STATUS
approved