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A199526
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Number of -4..4 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements.
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1
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1, 8, 60, 464, 3734, 30484, 252154, 2105064, 17701326, 149708146, 1272108368, 10851700690, 92875809416, 797134845184, 6858361265978, 59133629878796, 510815878314050, 4419961056157870, 38301854208088068, 332355738077962284
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=5
..2....4....4....2....1....4....3....2....0...-1....2...-4....2...-2...-4...-3
..1...-3...-1...-3....1...-1...-3...-2....2....4...-2....1...-1....4...-3....4
.-3...-3...-1....1...-3....1....3....2...-1....3...-2....2...-1...-1....0...-2
..2...-1....0....1...-2....0...-1....0....1...-4....3....3...-1...-1....3...-1
.-2....3...-2...-1....3...-4...-2...-2...-2...-2...-1...-2....1....0....4....2
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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