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
Keywords
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) +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
Comments