| 4, 10, 25, 63, 159, 402, 1017, 2573, 6510, 16472, 41679, 105461, 266850, 675216, 1708513, 4323086, 10938795, 27678662, 70035898, 177213300, 448406526, 1134612428, 2870933600, 7264383443, 18381221638, 46510390257, 117686215012, 297783895756, 753488830979
(list; graph; listen)
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