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A189500 Number of arrangements of 4 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero 1
0, 42, 152, 462, 1088, 2128, 3850, 6474, 10126, 15224, 22180, 30900, 42164, 56514, 73816, 94984, 120700, 150836, 186756, 228696, 276618, 332204, 396444, 467948, 549504, 642000, 744978, 859846, 988550, 1129542, 1286278, 1458874, 1646896 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A189498

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for n=5

..4...-2...-4...-2...-2....1....2....5...-1...-3....4....3...-3....4....4....2

..3...-4...-2...-5....4....2....2....4...-1...-5...-4....2....4...-5...-2...-1

.-2...-2....1....5....5...-5...-2...-3....2....4...-5...-2....2...-3...-1...-5

.-2....1....2....5....5...-4...-5...-3....3....2...-5...-5...-5...-5...-2...-2

CROSSREFS

Sequence in context: A299131 A158479 A188126 * A350579 A075289 A193571

Adjacent sequences:  A189497 A189498 A189499 * A189501 A189502 A189503

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 23 2011

STATUS

approved

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Last modified January 18 02:35 EST 2022. Contains 350410 sequences. (Running on oeis4.)