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A009813
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Expansion of tanh(tan(x))/cos(x).
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0
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1, 3, 17, 147, 3265, 248259, 25402769, 2697740307, 299763466753, 36321927229443, 5149754111041937, 933794260030934547, 223162280662322953153, 65749433548871560459971
(list; graph; refs; listen; history; internal format)
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