# A018444 (b-file synthesized from sequence entry)
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 10
9 12
10 14
11 15
12 20
13 21
14 28
15 30
16 35
17 42
18 60
19 70
20 84
21 105
22 140
23 210
24 420