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1, -1, 1, -3, 15, -75, 435, -3045, 29505, -305865, 3193785, -36542835, 501892335, -7286043555, 108056360475, -1793622856725, 32996752625025, -620276725767825, 11975531764755825, -249801487147455075, 5592450521376068175, -130966142569782327675
(list;
graph;
refs;
listen;
history;
text;
internal format)
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