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A121159
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Number of spiro bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition).
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2
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1, 4, 16, 53, 175, 547, 1692, 5127, 15408, 45831, 135500, 398186, 1165005, 3394880, 9861048, 28561403, 82525483, 237941827, 684778523, 1967510639
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