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A208966
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Number of n-bead necklaces labeled with numbers -4..4 allowing reversal, with sum zero and first and second differences in -4..4.
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1
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1, 2, 2, 8, 19, 90, 371, 1755, 8092, 37970, 179133, 857902, 4152036, 20313811, 100217735, 497983883, 2488970462, 12503041095, 63083893996, 319545209584, 1624399382535, 8284482761844, 42377064630483, 217362286106711, 1117715413419540, 5760869940768290
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OFFSET
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1,2
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LINKS
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EXAMPLE
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Some solutions for n=5:
.-2...-2...-2...-2...-3...-1...-1...-2...-2...-2...-1...-1....0...-1...-1...-1
..0...-2...-1....0...-2....0...-1...-1...-1...-2...-1...-1....0....0....0...-1
..0....0....1....1....2....0...-1....1....2....1....1....0....0....0....1....0
..2....2....2....1....3....1....1....1....2....2....0....2....0....0...-1....1
..0....2....0....0....0....0....2....1...-1....1....1....0....0....1....1....1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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