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1, 1, 3, 7, 19, 56, 180, 596, 2015, 6904, 23923, 83755, 296084, 1056095, 3797790, 13757665, 50164787, 183980036, 678215028, 2511483176, 9337575130, 34840575458, 130412367572, 489546890178, 1842438724560, 6950471604901, 26276784902865, 99539079724648, 377759500611913, 1436093975018569, 5468247624237042, 20853026397347178
(list;
graph;
refs;
listen;
history;
text;
internal format)
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