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A107706
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Quadratic recurrence a(n)=2a(n-1)^2+a(n-2), a(0)=a(1)=1.
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1, 1, 3, 19, 725, 1051269, 2210333021447, 9771144131398048324998887, 190950515273109040540985906104397627141067435498985, 72924198566131697919005645563941249133599421947333610081098812005030529313728193495031984760197059337
(list; graph; refs; listen; history; internal format)
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