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2, 1, 2, 4, 10, 25, 70, 201, 600, 1847, 5830, 18778, 61542, 204676, 689411, 2347970, 8074762, 28009676, 97909318, 344616322, 1220539397, 4347311908, 15564141262, 55985423060, 202256970300, 733607297260, 2670698800614, 9755982909133
(list; graph; refs; listen; history; internal format)
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