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Keywords: Multisets that contain m different elements n times.svg An illustration for A187783 the array that shows the number of possible permutations of these multisets These multisets have the signatures A249543 m n-1 for m> 1 and n> 2 i e they correspond to the integer partitions denoted by these numbers <br> The multisets in column 1 for m> 1 have signature 0 For empty sets the concept of a signature does not really make sense own Mate2code Cc-zero Multisets Balls in combinatorics |