1, 2, 3, 6, 15, 75, 219, 1335, 3246, 4975, 5475, 7775, 8922, 28614, 67675, 69998, 103135, 313609, 548983, 624193, 6539595, 13193562, 26383395, 111892866, 315953675, 5330142066, 33738816835, 66899423586, 336966134829, 645835313441, 742199683475, 1244107219389, 10187548490537, 760354210440662