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1, 2, 6, 20, 56, 208, 493, 1974, 4336, 18258, 38380, 167464, 342056, 1532376, 3067156, 14022168, 27646080, 128438893, 250291902, 1178090212, 2274524200, 10822168448, 20736353110, 99564168884, 189575748320, 917316990660
(list;
graph;
refs;
listen;
history;
text;
internal format)
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