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A013478
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arctanh(cos(x)-cosh(x))=-242/6!*x^6-735842/10!*x^10...
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242, 735842, 12696924242, 729261623797442, 105330801708282667442, 32155390653420235027326242, 18430773614710132775756232045842, 18200656974294045189446138614387578242
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