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1, 2, 4, 9, 18, 40, 80, 176, 352, 769, 1538, 3343, 6686, 14477, 28954, 62505, 125010, 269216, 538432, 1157244, 2314488, 4966260, 9932520, 21282622, 42565244, 91096110, 182192220, 389515284, 779030568, 1664015246, 3328030492
(list; graph; refs; listen; history; internal format)
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