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0, 2, 6, 20, 66, 210, 652, 1988, 5982, 17830, 52782, 155480, 456364, 1336066, 3904280, 11394244, 33222902, 96812174, 282009512, 821327088, 2391918708, 6966267782, 20291422370, 59116724728, 172271893036, 502157965938
(list; graph; refs; listen; history; internal format)
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