A222921 Number of nX3 0..4 arrays with no three equal values in a row horizontally or vertically, and new values 0..4 introduced in row major order.

4, 174, 13571, 1396408, 149478882, 16132176644, 1743046774975, 188375987615301, 20358991721595731, 2200340247114860719, 237806554693426088256, 25701465075957071507864, 2777742291970854979335967

Offset: 1

Author

R. H. Hardin Mar 09 2013

Keywords

• nonn

Comments

Column 3 of A222924

Examples

			Some solutions for n=3
..0..0..1....0..1..2....0..1..0....0..1..2....0..1..1....0..1..1....0..0..1
..2..0..3....3..4..4....1..2..3....1..0..1....0..2..2....0..2..2....1..2..3
..0..3..1....3..3..1....1..0..3....1..3..4....1..3..3....3..3..1....4..1..2
		

Links

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

Formula

Empirical: a(n) = 110*a(n-1) +152*a(n-2) -39692*a(n-3) +79710*a(n-4) +796150*a(n-5) -1333952*a(n-6) -1226634*a(n-7) -23628904*a(n-8) [phone]*a(n-9) [phone]*a(n-10) -123947190*a(n-11) -86026499*a(n-12) [phone]*a(n-13) [phone]*a(n-14) -15240812*a(n-15) -94039632*a(n-16) [phone]*a(n-17) [phone]*a(n-18) -10861760*a(n-19) -2218496*a(n-20) -2531712*a(n-21) -1928192*a(n-22) +635904*a(n-23) +317952*a(n-24)