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A288558
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Irregular triangle read by rows: distribution of inversion numbers over the set of permutations of the multiset {1,1,2,2,3,3,...,n,n} avoiding the pattern 123.
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1
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1, 1, 1, 2, 1, 1, 0, 0, 0, 0, 3, 3, 6, 7, 9, 7, 5, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 4, 6, 15, 18, 28, 35, 44, 47, 49, 42, 31, 18, 9, 3, 1
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,4
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LINKS
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EXAMPLE
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Triangle begins:
1,
1,1,2,1,1,
0,0,0,0,3,3,6,7,9,7,5,2,1,
0,0,0,0,0,0,0,0,1,1,4,6,15,18,28,35,44,47,49,42,31,18,9,3,1,
...
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CROSSREFS
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KEYWORD
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nonn,tabf,more
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AUTHOR
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STATUS
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approved
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