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Search: id:A091378
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| A091378 |
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Triangle read by rows: T(m,n) = number of Quillen model structures on the category corresponding to the poset of order-preserving maps from [m] to [n+1], where [m] denotes the total order on m objects. |
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+0
2
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| 1, 1, 1, 1, 2, 1, 1, 5, 5, 1, 1, 14, 96, 14, 1, 1, 42, 6560, 6560, 42, 1, 1, 132
(list; table; graph; listen)
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OFFSET
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0,5
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FORMULA
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T(m, n) = T(n, m) because the corresponding categories are isomorphic. T(0, n) = T(n, 0) = 1. T(1, n) = T(n, 1) = C(n+1) the (n+1)st Catalan number (A000108).
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CROSSREFS
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Cf. A000108.
Sequence in context: A099927 A128612 A060854 this_sequence A156045 A119687 A086856
Adjacent sequences: A091375 A091376 A091377 this_sequence A091379 A091380 A091381
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KEYWORD
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more,nonn,tabl
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AUTHOR
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Hugh Robinson (hugh(AT)mit.edu), Mar 01 2004
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