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1, -1, 1, -3, 8, -22, 62, -182, 550, -1694, 5294, -16758, 53635, -173260, 564129, -1849448, 6099972, -20227036, 67390803, -225485432, 757361764, -2552692848, 8631144354, -29268108530, 99511629658, -339167845294, 1158607479710, -3966129297519, 13603228472518
(list;
graph;
refs;
listen;
history;
text;
internal format)
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