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0, 2, 5, 20, 111, 704, 5015, 40284, 362831, 3628736, 39916719, 479001500, 6227020679, 87178291056, 1307674367831, 20922789887804, 355687428095775, 6402373705727744, 121645100408831711, 2432902008176639676
(list; graph; refs; listen; history; internal format)
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