A209020 Number of nX1 1..5 arrays with every element value z a city block distance of exactly z from another element value z

0, 1, 1, 3, 3, 16, 21, 71, 114, 305, 581, 1437, 2980, 6856, 14671, 32681, 70376, 156129, 340985, 753249, 1642055, 3601624, 7879835, 17280310, 37865836, 83031844, 181895623, 398628603, 873357406, 1913797135, 4194416039, 9193647288

Offset

1,4

Comments

Column 1 of A209023

Links

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

Example

All solutions for n=6
..2....3....3....5....2....4....1....3....4....2....4....5....2....1....1....5
..3....4....3....3....2....4....1....1....1....2....2....1....4....1....1....2
..2....2....3....1....2....1....2....1....1....2....3....1....2....3....1....2
..2....3....3....1....2....1....2....3....2....2....2....1....1....1....1....2
..3....2....3....3....2....4....2....1....4....1....4....1....1....1....1....2
..2....4....3....5....2....4....2....1....2....1....3....5....4....3....1....5

Crossrefs

Sequence in context: A222505 A292356 A370869 * A258204 A258017 A209055

Adjacent sequences: A209017 A209018 A209019 * A209021 A209022 A209023

Keyword

nonn

Author

R. H. Hardin Mar 04 2012

Status

approved