A223058 Number of nX4 0..3 arrays with all horizontally or vertically connected equal values in a straight line, and new values 0..3 introduced in row major order.

15, 1473, 213469, 31331820, 4606719559, 677531592132, 99653055754459, 14657362298142480, 2155865978887475959, 317093854966287823308, 46639503202294456685971, 6859935143940031077127272

Offset: 1

Author

R. H. Hardin Mar 13 2013

Keywords

• nonn

Comments

Column 4 of A223062

Examples

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

Links

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

Formula

Empirical: a(n) = 200*a(n-1) -8673*a(n-2) +135916*a(n-3) -736271*a(n-4) -465544*a(n-5) [phone]*a(n-6) -48454316*a(n-7) [phone]*a(n-8) [phone]*a(n-9) -200199168*a(n-10) [phone]*a(n-11) for n>12