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1, 2, 4, 8, 17, 40, 106, 316, 1049, 3830, 15208, 65072, 297841, 1449756, 7468542, 40555748, 231335961, 1381989882, 8623700812, 56078446616, 379233142801, 2662013133296, 19362917622002, 145719550012300, 1133023004941273, 9090156910550110, 75161929739797520
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refs;
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