cp's OEIS Frontend

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.

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A203297 Number of arrays of 14 nondecreasing integers in -n..n with sum zero and equal numbers greater than zero and less than zero.

Original entry on oeis.org

8, 36, 280, 1844, 9880, 43958, 168314, 568933, 1734054, 4842044, 12545910, 30469542, 69935848, 152731858, 319150868, 641127127, 1243115122, 2334434336, 4258292458, 7564553798, 13115830616, 22239519138, 36942424868, 60209406935
Offset: 1

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Author

R. H. Hardin Dec 31 2011

Keywords

Comments

Row 7 of A203291

Examples

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

Formula

Empirical: a(n) = 3*a(n-1) -a(n-2) -3*a(n-3) +a(n-4) -a(n-5) +4*a(n-6) -3*a(n-7) +3*a(n-8) +3*a(n-9) -4*a(n-10) -2*a(n-11) -3*a(n-12) -2*a(n-13) +8*a(n-15) +7*a(n-17) -2*a(n-18) -a(n-19) -5*a(n-20) -13*a(n-21) +3*a(n-22) +a(n-23) +5*a(n-24) +6*a(n-25) +5*a(n-26) +a(n-27) +3*a(n-28) -13*a(n-29) -5*a(n-30) -a(n-31) -2*a(n-32) +7*a(n-33) +8*a(n-35) -2*a(n-37) -3*a(n-38) -2*a(n-39) -4*a(n-40) +3*a(n-41) +3*a(n-42) -3*a(n-43) +4*a(n-44) -a(n-45) +a(n-46) -3*a(n-47) -a(n-48) +3*a(n-49) -a(n-50)
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