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A166922
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Numbers defined by the e.g.f.:exp(-x)*exp(exp(2*x)/2-1/2).
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0
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1, 0, 1, 2, 10, 48, 276, 1768, 12552, 97408, 818704, 7396384, 71380640, 732058880, 7943068992, 90833753728, 1091134058624, 13728139694080, 180436251140352, 2471790031618560
(list; graph; refs; listen; history; internal format)
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