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 A202080 Number of arrays of 9 integers in -n..n with sum zero and the sum of every adjacent pair being odd 1
 6, 726, 8412, 80812, 340660, 1516410, 4213042, 12861252, 28421280, 69306670, 132493530, 278307730, 481381744, 909136644, 1461430338, 2548699638, 3874036128, 6350628468, 9236088510, 14409332790, 20220953874, 30295374604 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 7 of A202076 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = a(n-1) +8*a(n-2) -8*a(n-3) -28*a(n-4) +28*a(n-5) +56*a(n-6) -56*a(n-7) -70*a(n-8) +70*a(n-9) +56*a(n-10) -56*a(n-11) -28*a(n-12) +28*a(n-13) +8*a(n-14) -8*a(n-15) -a(n-16) +a(n-17) EXAMPLE Some solutions for n=3 ..0...-2...-2....2....2....2....2....2....0....0...-2...-2....2....0....0....2 ..1....3....3....3....3....1...-1...-3...-1....1...-3....3....3....3...-1...-1 .-2....2....0....2...-2....2...-2....0....2...-2...-2...-2....2....0....2....0 ..1...-3....3...-1...-3....1....3...-1...-3....3....1....1...-1....3....1....1 ..0....0....2....0....2....0...-2....0...-2...-2....0...-2...-2...-2....2....0 ..1....3...-3...-3....3...-1....1....3....3...-3....3....3...-3...-3...-1...-3 .-2....0...-2...-2...-2...-2....0...-2...-2....2....2...-2....0....2....0...-2 ..1...-1...-1...-1...-3...-3....1....3....1....3....3....3...-1...-3...-1....1 ..0...-2....0....0....0....0...-2...-2....2...-2...-2...-2....0....0...-2....2 CROSSREFS Sequence in context: A080369 A036981 A343434 * A271528 A316748 A354251 Adjacent sequences:  A202077 A202078 A202079 * A202081 A202082 A202083 KEYWORD nonn AUTHOR R. H. Hardin Dec 10 2011 STATUS approved

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Last modified August 16 05:55 EDT 2022. Contains 356160 sequences. (Running on oeis4.)