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%I #4 Mar 31 2012 12:36:11
%S 0,300,1632,7092,16484,43440,75080,142532,232432,380244,525668,841504,
%T 1099064,1531092,2070976,2785252,3396316,4539424,5414024,6981628,
%U 8554708,10387240,11982424,15101088,17498972
%N Number of arrangements of 6 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero
%C Row 4 of A188249
%e Some solutions for n=4
%e .-4....2...-4...-1....2....4....3....4....3....3....1...-3...-1...-2...-3....3
%e ..1...-3...-2....2...-1...-1....1...-2...-2....4...-4....3....3....3...-1...-4
%e .-2...-3...-4...-1...-2...-2...-2....2....2....4...-4....1...-2....1...-2...-4
%e .-4....3....4...-4....1....2...-4...-2...-1...-2....1....2....3....3....2...-4
%e ..1....3...-3...-3...-1....2....3...-4...-4....4...-4...-4....3....1....1....4
%e ..2...-1...-4....4...-3....1....1...-2...-2...-3....1...-3....2...-3...-3...-1
%K nonn
%O 1,2
%A _R. H. Hardin_ Mar 25 2011
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