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1, 2, 4, 6, 11, 19, 35, 62, 112, 201, 361, 651, 1173, 2113, 3807, 6859, 12360, 22273, 40135, 72321, 130321, 234837, 423171, 762547, 1374097, 2476099, 4461889, 8040249, 14488392, 26107837, 47045881, 84775884
(list; graph; refs; listen; history; internal format)
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