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A090409
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7*8^n/9+2(-1)^n/9.
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1
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1, 6, 50, 398, 3186, 25486, 203890, 1631118, 13048946, 104391566, 835132530, 6681060238, 53448481906, 427587855246, 3420702841970, 27365622735758, 218924981886066, 1751399855088526, 14011198840708210, 112089590725665678
(list; graph; refs; listen; history; internal format)
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