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1, 2, 9, 44, 700, 7224, 91728, 1384704, 321681456, 9607635360, 309488747040, 10962174026880, 422888522509440, 17631921963720960, 789561144589190400, 37775032089229209600, 97401432766454375731200, 6978149921526727832985600, 528364219172258186674790400
(list;
graph;
refs;
listen;
history;
text;
internal format)
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