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1, 2, 6, 20, 210, 792, 8008, 31824, 319770, 6906900, 30045015, 600805296, 5586853480, 25518731280, 239877544005, 4481381406320, 79960182801345, 387221678682300, 6848956078664700, 63484158299081520, 312049055023946856, 5469191608792974920, 50825908693881519120
(list;
graph;
refs;
listen;
history;
text;
internal format)
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