A208957 Number of nX1 0..5 arrays with every element value z a city block distance of exactly z from another element value z

1, 2, 5, 12, 33, 99, 286, 794, 2235, 6193, 17584, 49978, 141115, 397871, 1119496, 3143540, 8816661, 24794657, 69734595, 196208514, 550646282, 1545975038, 4342120668, 12196239620, 34268355937, 96256484372, 270382410201

Offset

1,2

Comments

Column 1 of A208960

Links

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

Example

Some solutions for n=7
..1....3....4....0....1....2....0....5....2....0....3....5....0....0....0....3
..1....0....0....2....1....0....0....0....3....1....0....2....5....4....5....0
..2....3....4....3....1....2....0....4....2....1....0....2....1....1....2....0
..2....3....2....2....0....0....2....1....0....3....3....2....1....1....2....3
..2....2....4....2....0....2....0....1....3....1....0....2....0....0....2....1
..2....3....2....3....0....0....2....5....1....1....1....5....0....4....2....1
..2....2....4....2....0....0....0....4....1....3....1....0....5....0....5....3

Crossrefs

Sequence in context: A186739 A266292 A004114 * A209051 A209216 A076864

Adjacent sequences: A208954 A208955 A208956 * A208958 A208959 A208960

Keyword

nonn

Author

R. H. Hardin Mar 03 2012

Status

approved