A188252 - OEIS

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A188252

Number of arrangements of 6 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero

0, 300, 1632, 7092, 16484, 43440, 75080, 142532, 232432, 380244, 525668, 841504, 1099064, 1531092, 2070976, 2785252, 3396316, 4539424, 5414024, 6981628, 8554708, 10387240, 11982424, 15101088, 17498972

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Row 4 of A188249

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Some solutions for n=4

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

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

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