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A209717 Number of nX1 0..4 arrays with every element value z a city block distance of exactly z from another element value z 1
1, 2, 5, 12, 33, 87, 227, 583, 1538, 4067, 10633, 27837, 72387, 188811, 493437, 1288622, 3355810, 8740288, 22783725, 59403150, 154824944, 403509362, 1051651919, 2740858097, 7144656505, 18623531350, 48542955448, 126526434447 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 1 of A209720

LINKS

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

EXAMPLE

Some solutions for n=7

..3....3....0....1....2....0....4....3....2....1....1....3....0....0....1....0

..4....0....0....1....4....0....4....4....2....1....1....3....0....0....1....0

..2....2....4....4....2....1....0....2....2....1....0....4....2....4....1....0

..3....3....0....1....3....1....3....3....2....1....0....3....0....0....1....2

..2....2....0....1....2....1....4....2....2....1....0....3....2....1....2....2

..4....1....0....1....4....1....4....4....2....0....0....0....1....1....0....2

..3....1....4....4....3....0....3....2....2....0....0....4....1....4....2....2

CROSSREFS

Sequence in context: A176336 A010843 A084075 * A000560 A292212 A212823

Adjacent sequences:  A209714 A209715 A209716 * A209718 A209719 A209720

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 12 2012

STATUS

approved

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Last modified March 19 13:22 EDT 2019. Contains 321330 sequences. (Running on oeis4.)