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1, 4, 129, 520, 16769, 67596, 2179841, 8786960, 283362561, 1142237204, 36834953089, 148482049560, 4788260539009, 19301524205596, 622437035118081, 2509049664677920, 80912026304811521, 326157154883924004
(list; graph; refs; listen; history; internal format)
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