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A076575
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a(0)=1 if n>0 a(n)=(-1)^(n+1)/(2n+1)*sum(k=0,n,4^(7k)*B(2k)*C(2n+1,2k)) where B(k) denotes the k-th Bernoulli number.
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0
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1, 2731, 8942387, 104670662071, 2400942582854087, 89402734746017557411, 4893960739529013452828987, 369582933150490997215583309551, 36809796323680462279091281973219087
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