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A293961
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Number T(n,k) of linear chord diagrams having n chords and maximal chord length k (or k=0 if n=0); triangle T(n,k), n>=0, 0<=k<=n, read by rows.
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5
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1, 0, 1, 0, 1, 2, 0, 1, 4, 10, 0, 1, 10, 24, 70, 0, 1, 20, 82, 212, 630, 0, 1, 42, 300, 798, 2324, 6930, 0, 1, 84, 894, 3800, 10078, 30188, 90090, 0, 1, 170, 2744, 18186, 51804, 150046, 452724, 1351350, 0, 1, 340, 8594, 71624, 313006, 851692, 2545390, 7695828, 22972950
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OFFSET
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0,6
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COMMENTS
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All terms in columns k > 1 are even.
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LINKS
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FORMULA
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EXAMPLE
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Triangle T(n,k) begins:
1;
0, 1;
0, 1, 2;
0, 1, 4, 10;
0, 1, 10, 24, 70;
0, 1, 20, 82, 212, 630;
0, 1, 42, 300, 798, 2324, 6930;
0, 1, 84, 894, 3800, 10078, 30188, 90090;
0, 1, 170, 2744, 18186, 51804, 150046, 452724, 1351350;
...
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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