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0, 0, 0, 2, 3, 6, 11, 20, 36, 69, 126, 237, 446, 841, 1595, 3046, 5840, 11238, 21684, 41955, 81333, 158007, 307378, 598968, 1168767, 2283307, 4465653, 8742429, 17130723, 33594988, 65933365, 129491817, 254484590, 500430065, 984625784
(list; graph; refs; listen; history; internal format)
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