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1, 1, 4, 4, 4, 4, 20, 36, 52, 132, 292, 580, 1252, 2628, 6196, 13412, 28884, 64516, 147140, 327684, 722116, 1615236, 3758292, 8500772, 19027572, 43203204, 100782308, 230210884, 522001572, 1193084612, 2800307188, 6441467748, 14722404372
(list;
graph;
refs;
listen;
history;
text;
internal format)
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