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A189955 1/4 the number of arrangements of 6 nonzero numbers x(i) in -n..n with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero 1
16, 280, 2393, 9884, 31284, 77459, 168737, 327880, 595697, 1005710, 1621554, 2504978, 3738572, 5418036, 7662698, 10565406, 14315713, 19055943, 24956731, 32281835, 41217268, 51991454, 64917759, 80355606, 98539718, 119899372 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 5 of A189951

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..125

EXAMPLE

Some solutions with n=3

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

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

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

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

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

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

CROSSREFS

Sequence in context: A231695 A004382 A204955 * A038758 A240336 A281341

Adjacent sequences:  A189952 A189953 A189954 * A189956 A189957 A189958

KEYWORD

nonn

AUTHOR

R. H. Hardin May 02 2011

STATUS

approved

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Last modified September 18 20:36 EDT 2019. Contains 327181 sequences. (Running on oeis4.)