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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
OFFSET
1,2
COMMENTS
Diagonal of A189951
LINKS
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: A084096 A361238 A353993 * A358324 A137664 A317028
KEYWORD
nonn
AUTHOR
R. H. Hardin May 02 2011
STATUS
approved