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A090646
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a(n)=(-1)^(n+1)*6*(36^n-1)*B(2n) where B(k) denotes the k-th Bernoulli number.
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0
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0, 35, 259, 6665, 335923, 27484625, 3305838667, 548549148665, 120046523944291, 33497222700551585, 11607372388687929595, 4890106826755096362185, 2461501533722532841839379, 1459003091037934911760465265
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