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 A325331 Number of integer partitions of n whose multiplicities appear with distinct multiplicities that cover an initial interval of positive integers. 4
 1, 1, 2, 2, 3, 2, 4, 3, 7, 10, 14, 18, 30, 34, 44, 65, 73, 88, 110, 127, 155, 183, 202, 231, 277, 301, 339, 382, 430, 461, 551, 579, 681, 762, 896, 1010, 1255, 1406, 1752, 2061, 2555, 3001, 3783, 4437, 5512, 6611, 8056, 9539, 11668, 13692, 16515, 19435, 23098 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Partitions with distinct multiplicities that cover an initial interval of positive integers are counted by A320348, with Heinz numbers A325337. Partitions whose multiplicities appear with distinct multiplicities are counted by A325329, with Heinz numbers A325369. Partitions whose multiplicities appear with multiplicities that cover an initial interval of positive integers of counted by A325330, with Heinz numbers A325370. The Heinz numbers of these partitions are given by A325371. LINKS EXAMPLE The a(0) = 1 through a(8) = 7 partitions:   ()  (1)  (2)   (3)    (4)     (5)      (6)       (7)        (8)            (11)  (111)  (22)    (11111)  (33)      (3211)     (44)                         (1111)           (222)     (1111111)  (2222)                                          (111111)             (3221)                                                               (4211)                                                               (32111)                                                               (11111111) For example, the partition p = (5,5,4,3,3,3,2,2) has multiplicities (2,3,1,2), which appear with multiplicities (1,2,1), which cover an initial interval but are not distinct, so p is not counted under a(27). The partition q = (5,5,5,4,4,4,3,3,2,2,1,1) has multiplicities (3,3,2,2,2), which appear with multiplicities (3,2), which are distinct but do not cover an initial interval, so q is not counted under a(39). The partition r = (3,3,2,1,1) has multiplicities (2,1,2), which appear with multiplicities (1,2), which are distinct and cover an initial interval, so r is counted under a(10). MATHEMATICA normQ[m_]:=Or[m=={}, Union[m]==Range[Max[m]]]; Table[Length[Select[IntegerPartitions[n], normQ[Length/@Split[Sort[Length/@Split[#]]]]&&UnsameQ@@Length/@Split[Sort[Length/@Split[#]]]&]], {n, 0, 30}] CROSSREFS Cf. A098859, A130091, A317081, A317090, A320348, A325329, A325330, A325337, A325369, A325370, A325371. Sequence in context: A061889 A240089 A218700 * A333108 A266935 A175012 Adjacent sequences:  A325328 A325329 A325330 * A325332 A325333 A325334 KEYWORD nonn AUTHOR Gus Wiseman, May 01 2019 STATUS approved

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Last modified September 28 03:45 EDT 2021. Contains 347698 sequences. (Running on oeis4.)