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1, 6, 24, 144, 541, 3258, 12275, 74280, 282003, 1713690, 6549906, 39938616, 153481299, 938430990, 3622111560, 22195961280, 85975792075, 527816696850, 2050493623760, 12607504827600, 49098707209695, 302275142049870, 1179633190545755, 7270432009471224, 28423658754983701
(list;
graph;
refs;
listen;
history;
text;
internal format)
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