# A198891 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 7 4 32 5 180 6 1219 7 9646 8 87192 9 886536 10 10016159 11 124481258 12 1687686528 13 24787991800 14 392081193504 15 6644677619581 16 120115898158288 17 2307044712629472 18 46917527736860976 19 1007152702625923440 20 22757886107313170356 21 539955309450787483261 22 13421068671117864869156