| 1, -1, 4, -9, 24, -60, 154, -391, 997, -2538, 6465, -16464, 41932, -106792, 271981, -692685, 1764144, -4492953, 11442736, -29142568, 74220826, -189026955, 481417305, -1226082390, 3122609041, -7952717776, 20254126984, -51583580784, 131374006329, -334585720425, 852129027964
(list; graph; listen)
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