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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A200559 Number of -n..n arrays x(0..8) of 9 elements with zero sum and nonzero second differences.

Original entry on oeis.org

778, 91058, 1639804, 13587804, 72366820, 288237528, 936121220, 2613794508, 6492378076, 14694189538, 30833955936, 60757353766, 113535692414, 202761648044, 348183768616, 577776075892, 930286238568, 1458297755836
Offset: 1

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Author

R. H. Hardin Nov 19 2011

Keywords

Comments

Row 7 of A200553

Examples

			Some solutions for n=3
.-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3
.-3....1...-3....1....0....1....0....0....0....1...-3....1....1....1....0....1
..3....3...-1....2....2....2....1...-3...-3....0...-1...-1...-2....3...-1....1
..0....3....3....1....0....1...-1....3....2...-3....2...-1....3....2....1....2
..3....0...-2....2...-3...-1....3....1....1....0....3....3....2....0....2....0
..0...-2....3...-3...-3...-2...-2....3...-1....1....0....1...-3....1....2...-3
..2....0....2....2....3....3....2...-1....3....1....1....3...-2...-2...-1....1
.-2....1....0...-1....2...-3....1...-2....2....3....3...-2....3...-3...-2...-2
..0...-3....1...-1....2....2...-1....2...-1....0...-2...-1....1....1....2....3

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