# A180016 (b-file synthesized from sequence entry)
0 1
1 1
2 7
3 19
4 109
5 469
6 2509
7 12589
8 67399
9 358039
10 1946395
11 10622755
12 58600531
13 324978643
14 1813780243
15 10169519635
16 57273912685
17 323755931917
18 1836345339961
19 10446793409041
20 59591722204861
21 340755882430381