| 1, 4, 16, 64, 253, 1000, 3952, 15616, 61705, 243820, 963424, 3806848, 15042277, 59437648, 234860320, 928020736, 3666956113, 14489511508, 57253465072, 226229798080, 893918323981, 3532204761400, 13957058650384, 55149545207296, 217916425857241, 861069089144764
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