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0, 5, 21, 81, 330, 1287, 4995, 19448, 75582, 293895, 1144066, 4457400, 17383734, 67863915, 265182525, 1037157858, 4059928950, 15905368710, 62359142274, 244662670200, 960566918220, 3773655743715, 14833897694226, 58343356817424
(list; graph; refs; listen; history; internal format)
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