| 1, -3, 8, -24, 70, -204, 596, -1740, 5080, -14832, 43304, -126432, 369136, -1077744, 3146624, -9187008, 26822752, -78312768, 228645056, -667561152, 1949037952, -5690488320, 16614174848, -48507402240, 141624130816, -413491415808, 1207245897728, -3524722888704, 10290920404480
(list; graph; listen)
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