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发表于 2011-7-5 10:53
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在线数学符号表公式,序列百科
贝尔数:
Bell or exponential numbers: ways of placing n labeled balls into n indistinguishable boxes.
(Formerly M1484 N0585)
1, 1, 2, 5, 15, 52, 203, 877, 4140, 21147, 115975, 678570, 4213597, 27644437, 190899322, 1382958545, 10480142147, 82864869804, 682076806159, 5832742205057, 51724158235372, 474869816156751, 4506715738447323, 44152005855084346
http://oeis.org/search?q=bell&sort=&language=english
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