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 A211462 Number of -2..2 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having one, two or three distinct values for every i<=n and j<=n 1
 25, 65, 169, 407, 977, 2283, 5313, 12259, 28253, 65023, 149817, 345739, 799821, 1855467, 4317293, 10077003, 23592677, 55403427, 130474345, 308095007, 729314485, 1730363331, 4113892073, 9798957667, 23379161753, 55863031875 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 6*a(n-1) -a(n-2) -55*a(n-3) +70*a(n-4) +193*a(n-5) -357*a(n-6) -320*a(n-7) +802*a(n-8) +238*a(n-9) -922*a(n-10) -39*a(n-11) +533*a(n-12) -29*a(n-13) -136*a(n-14) +6*a(n-15) +12*a(n-16) EXAMPLE Some solutions for n=5 .-1....1....0....2...-2....0...-2....1....0....0...-2...-1....0....0...-1...-2 ..0...-1...-2...-2...-1....1....2....0....2....0....0....0....0...-1....1....2 .-1...-1....0....0....0....0...-2....0...-2...-2...-2....0...-2....0....1...-2 ..0...-1...-2...-2...-1....1....2...-2....2....2....0...-1....0....0....1....0 ..1...-1....2....2....0...-1...-2....0....0...-2...-2....0....0....0...-1....0 ..2...-1....2....2...-1...-1...-2...-2....0....0....2....0....1....0...-1...-2 CROSSREFS Sequence in context: A043979 A033682 A020283 * A137186 A109676 A223888 Adjacent sequences:  A211459 A211460 A211461 * A211463 A211464 A211465 KEYWORD nonn AUTHOR R. H. Hardin Apr 12 2012 STATUS approved

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