A233109 Number of nX4 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally or vertically, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order.

23, 6046, 2154065, 794723482, 294285758398, 109015274761891, 40385221182281560, 14960955484170769147, 5542380989283805407733, 2053210330075493118514936, 760624844506193044187974495

Offset: 1

Author

R. H. Hardin, Dec 04 2013

Keywords

• nonn

Comments

Column 4 of A233113

Examples

			Some solutions for n=2
..0..1..5..4....0..1..2..4....0..1..2..5....0..1..2..2....0..1..2..5
..2..5..4..2....1..5..2..5....4..3..0..3....1..0..1..2....3..5..4..5
		

Links

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

Formula

Empirical: a(n) = 445*a(n-1) -29415*a(n-2) +684239*a(n-3) -6544703*a(n-4) [phone]*a(n-5) -37153497*a(n-6) [phone]*a(n-7)