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A275291
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Number of set partitions of [n] with symmetric block size list of length seven.
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2
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1, 4, 50, 250, 2160, 12256, 91925, 559987, 3939653, 24964844, 170468820, 1104449861, 7440709045, 48835462696, 327230257098, 2164985118201, 14485751773693, 96353703793654, 644984901718337, 4306885857654070, 28868100135841407, 193352040530826181
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OFFSET
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7,2
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LINKS
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FORMULA
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EXAMPLE
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a(8) = 4: 1|2|3|45|6|7|8, 1|2|3|46|5|7|8, 1|2|3|47|5|6|8, 1|2|3|48|5|6|7.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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