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1, -1, 4, -15, 36, -119, 302, -911, 2440, -7199, 20186, -60359, 177204, -546615, 1683286, -5401759, 17456128, -58447151, 197925490, -691264279, 2446636396, -8897012871, 32811147054, -123933345455, 474792813176, -1858243857599, 7375013350282, -29840434526951
(list; graph; refs; listen; history; internal format)
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