[seqfan] Regarding A122172 - A proper definition is needed for this sequence
David Scambler
dscambler at bmm.com
Thu Aug 4 02:14:21 CEST 2011
Part of the problem with presenting this sequence is that it is an infinite sequence of rectangular arrays, not of integers.
The j'th array in the triangle has j+1 columns and partitions(j) rows.
Each row of the j'th section corresponds to a partition of j and answers the following question:
How many ways may 0<=k<=j indistinguishable balls be dropped into a set of urns whose maximum capacities
are determined by the parts of a partition of j?
e.g. j = 3
Urns k= 0 1 2 3
======== =======
(3) 1 1 1 1
(2)(1) 1 2 2 1
(1)(1)(1) 1 3 3 1
dave
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