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A209391 Number of nX2 1..4 arrays with every element value z a city block distance of exactly z from another element value z 1
1, 2, 16, 152, 1449, 11655, 89469, 705803, 5771383, 45213223, 344221421, 2576621623, 19476715122, 147713174987, 1110131277687, 8315461638940, 62491630903612, 470960349189386, 3550021202822759, 26747955424745122 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A209394

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..122

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A332566 A085510 A290785 * A259901 A209021 A209056

Adjacent sequences:  A209388 A209389 A209390 * A209392 A209393 A209394

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 07 2012

STATUS

approved

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Last modified December 9 06:07 EST 2021. Contains 349627 sequences. (Running on oeis4.)