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1, 3, 11, 53, 261, 1303, 6511, 32553, 162761, 813803, 4069011, 20345053, 101725261, 508626303, 2543131511, 12715657553, 63578287761, 317891438803, 1589457194011, 7947285970053, 39736429850261, 198682149251303, 993410746256511
(list; graph; refs; listen; history; internal format)
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