# A331558 (b-file synthesized from sequence entry) 1 0 2 1 3 2 4 3 5 4 6 20 7 216 8 1862 9 13840 10 104904 11 949200 12 10517232 13 130307904 14 1694503824 15 23063845728 16 335427395760 17 5269616092416 18 88835797577472 19 1587229554415104 20 29838489410093184 21 589394278657267200 22 12235109311726689024 23 266570965998899071488