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A056885
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Triangle T(n,k) = number of minimal covers of an unlabeled n-set that cover k points of that set uniquely, k=0..n.
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12
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1, 0, 1, 0, 0, 2, 0, 0, 1, 3, 0, 0, 1, 3, 5, 0, 0, 1, 5, 8, 7, 0, 0, 1, 8, 19, 17, 11, 0, 0, 1, 12, 45, 56, 35, 15, 0, 0, 1, 17, 107, 194, 151, 65, 22, 0, 0, 1, 24, 244, 713, 728, 365, 118, 30, 0, 0, 1, 32, 547, 2697, 3996, 2413, 835, 203, 42, 0, 0, 1, 42, 1173, 10356, 24446
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,6
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COMMENTS
| Row sums give A048194.
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LINKS
| V. Jovovic, Formula for T(n,k).
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EXAMPLE
| [1], [0,1], [0,0,2], [0,0,1,3], [0,0,1,3,5], [0,0,1,5,8,7], ...; There are 21=1+5+8+7 minimal covers of an unlabeled 5-set.
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CROSSREFS
| Cf. A035347 for labeled case.
Sequence in context: A116489 A166373 A202451 * A029373 A029362 A114510
Adjacent sequences: A056882 A056883 A056884 * A056886 A056887 A056888
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KEYWORD
| nonn,tabl,nice
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 04 2000
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