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1, 6, 30, 144, 687, 3296, 15972, 78294, 388320, 1947910, 9875566, 50560246, 261177401, 1360112590, 7134802722, 37673830960, 200106632766, 1068539351340, 5733226876876, 30894846668416, 167137498306038, 907416216735816
(list;
graph;
refs;
listen;
history;
text;
internal format)
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