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# User:Thomas Wieder

Counting of hierarchical orderings (e.g. https://oeis.org/A075729), rankings (e.g. https://oeis.org/A083355), coalitions (e.g. https://oeis.org/A131407), multiselections (https://oeis.org/A188667).

Thomas Wieder: Generation of All Possible Multiselections from a Multiset, Progress in Applied Mathematics 2(1) (2011), 61-66.

Thomas Wieder: The number of certain rankings and hierarchies formed from labeled or unlabeled elements and sets, APPLIED MATHEMATICAL SCIENCES 3(55) (2009), 2707-2724.

Thomas Wieder: The Number Of Certain k-Combinations Of An n-Set, Applied Mathematical E-Notes 8 (2008), 42-52.

N. J. A. Sloane and T. Wieder: The Number of Hierarchical Orderings, Order 21(1) (2004), 83-89.