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1, 2, 7, 24, 77, 241, 738, 2227, 6650, 19711, 58114, 170682, 499911, 1461284, 4265437, 12438449, 36247956, 105589899, 307513742, 895514715, 2607925982, 7595726764, 22127052759, 64473303788, 187912261301, 547850119836
(list; graph; refs; listen; history; internal format)
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