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1, 1, 1, 3, 9, 45, 225, 1575, 11025, 99225, 893025, 9823275, 108056024, 1404728312, 18261451790, 273921776850, 4108787293579, 69849383990843, 1187387325581683, 22560359186051977, 428591632052426778, 9000424273100962338, 188954690005716285164
(list;
graph;
refs;
listen;
history;
text;
internal format)
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