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A189943 1/4 the number of arrangements of n+1 nonzero numbers x(i) in -n..n with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero 1
1, 8, 63, 1246, 31284, 839968, 26586582, 1012894742, 43952718714, 2154085255777, 116337778510833, 6974910796570573, 453756196177752909, 32037319291934188145, 2433852671789915900894, 198648198467160364716000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A189951

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..18

EXAMPLE

Some solutions with n=3

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

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

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

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

CROSSREFS

Sequence in context: A037205 A302399 A084096 * A137664 A317028 A014392

Adjacent sequences:  A189940 A189941 A189942 * A189944 A189945 A189946

KEYWORD

nonn

AUTHOR

R. H. Hardin May 02 2011

STATUS

approved

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Last modified October 19 17:54 EDT 2021. Contains 348091 sequences. (Running on oeis4.)