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1, -15, 105, -470, 1590, -4593, 12160, -30075, 69780, -153750, 325728, -667020, 1323915, -2557140, 4824630, -8912759, 16148505, -28746945, 50364835, -86956260, 148098384, -249060745, 413975085, -680602545
(list; graph; refs; listen; history; internal format)
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