A206385 Number of n X 4 0..6 arrays with no element equal to another within a city block distance of two, and new values 0..6 introduced in row major order.

2, 33, 1368, 67716, 3328979, 164270604, 8094257014, 399073153303, 19671060879306, 969710249315342, 47801400299066037, 2356379708874988482, 116157573684573753928, 5725991875022057193833, 282262740672653624738188, 13914145046466342831542252, 685897849965998299017561091

Offset: 1

Author

R. H. Hardin, Feb 07 2012

Keywords

• nonn
• changed

Examples

			Some solutions for n=4:
..0..1..2..0....0..1..2..3....0..1..2..3....0..1..2..3....0..1..2..0
..2..3..4..5....3..4..5..6....2..3..4..5....2..3..4..5....2..3..4..5
..1..5..6..3....6..2..0..1....1..5..6..0....4..5..0..6....5..6..0..1
..0..2..1..4....0..1..3..2....3..4..1..2....6..1..3..4....4..1..5..6
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..29

Crossrefs

Column 4 of A206389.