# A022490 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 6 5 11 6 29 7 90 8 447 9 2777 10 21492 11 189275 12 1875602 13 20491475 14 244801738 15 3171481173 16 44283667569 17 662856700938 18 10587645550783 19 179737770922111 20 3231504327224830