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 A188360 Number of arrangements of 5 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero 1
 91, 565, 1775, 4201, 8051, 14477, 22583, 34625, 49755, 69749, 91855, 123945, 155779, 197533, 247399, 304785, 361755, 440021, 512415, 611097, 715123, 826765, 936711, 1090865, 1233531, 1393541, 1568623, 1774089, 1955795, 2212029, 2421127, 2686881 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 4 of A188358 LINKS R. H. Hardin, Table of n, a(n) for n = 1..47 EXAMPLE Some solutions for n=4 ..4....1....4...-3...-2...-1....1...-4...-3....2....3...-1....1....3...-2....0 ..1...-4....3....1....0....3....3...-3....0....0....0....0....0...-1....2....0 ..1....4...-2...-2...-1....0....3....0...-4...-2...-2....3....4...-3....2...-2 .-1....4....2...-1....0...-1...-2...-3....0....0....0....3....0....1...-1....0 ..4....1...-1...-3....0...-3....3....4....1....1....2...-3...-4....3...-2....2 CROSSREFS Sequence in context: A063137 A180942 A211447 * A165220 A020218 A217841 Adjacent sequences:  A188357 A188358 A188359 * A188361 A188362 A188363 KEYWORD nonn AUTHOR R. H. Hardin Mar 28 2011 STATUS approved

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