A209179 Number of nX1 1..6 arrays with no element with value z exactly a city block distance of z from another element with value z

6, 35, 199, 1094, 5835, 29917, 147568, 722298, 3540171, 17225406, 84132756, 409658476, 2007252588, 9843963671, 48324194072, 236930814716, 1163154873317, 5714832229331, 28030173232886, 137489471523993, 674458662089566

Offset

1,1

Comments

Column 1 of A209182

Links

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

Example

Some solutions for n=7
..4....4....3....2....4....6....5....2....6....5....3....2....4....5....6....5
..1....1....2....6....5....4....1....6....5....6....6....6....6....5....4....2
..6....5....3....4....2....5....3....6....1....1....3....1....4....5....4....1
..5....4....4....1....6....1....5....1....3....5....5....5....3....5....6....3
..1....6....4....5....5....2....6....4....5....6....3....6....3....4....1....2
..2....4....4....6....2....3....6....1....6....6....6....5....6....2....5....4
..3....2....6....3....3....3....6....6....1....4....3....3....1....3....1....4

Crossrefs

Sequence in context: A171311 A230713 A131435 * A370036 A081105 A079027

Adjacent sequences: A209176 A209177 A209178 * A209180 A209181 A209182

Keyword

nonn

Author

R. H. Hardin Mar 05 2012

Status

approved