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A069159
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a(n) = d(1) - d(2) + d(3) - d(4) + ... + (-1)^(n+1) d(n), where d(k) denotes the k-th term of the digit sequence 3, 1, 4, 1, 5, 9,.... of Pi.
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0
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3, 2, 6, 5, 10, 1, 3, -3, 2, -1, 4, -4, 5, -2, 7
(list; graph; refs; listen; history; internal format)
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