# A269306 (b-file synthesized from sequence entry)
1 0
2 1
3 3
4 6
5 19
6 69
7 399
8 1999
9 9999
10 99999
11 1999999
12 39999999
13 699999999
14 19999999999
15 699999999999
16 39999999999999
17 1999999999999999
18 99999999999999999
19 9999999999999999999
20 1999999999999999999999