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1, 2, 4, 9, 23, 59, 155, 429, 1188, 3298, 9181, 25634, 71781, 201569, 571795, 1639244, 4702499, 13500396, 38790727, 111555296, 321100627, 925086012, 2667533646, 7698716068, 22238169212, 64473303788, 187912261301, 547850119836
(list; graph; refs; listen; history; internal format)
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