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A209361 Number of nX2 1..3 arrays with every element value z a city block distance of exactly z from another element value z 1
1, 2, 16, 122, 690, 4098, 24301, 131984, 720033, 3945050, 21470933, 115976303, 629975658, 3432416744, 18721854079, 102389248936, 560740694837, 3070272326544, 16802201754590, 91916873329401, 502611764211182 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A209365

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

..3..2....2..2....3..2....3..2....3..2....3..3....2..2....3..2....2..2....3..3

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

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

CROSSREFS

Sequence in context: A025185 A090672 A200820 * A229808 A301947 A027309

Adjacent sequences:  A209358 A209359 A209360 * A209362 A209363 A209364

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 06 2012

STATUS

approved

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Last modified August 4 20:00 EDT 2020. Contains 336202 sequences. (Running on oeis4.)