# A006841 (b-file synthesized from sequence entry)
1 1
2 1
3 1
4 2
5 4
6 10
7 28
8 127
9 686
10 4975
11 42529
12 420948
13 4622509
14 55670332
15 726738971
16 10217376792
17 153848448652
18 2470073249960
19 42120966152815
20 760282326662191
21 14481561464994821
22 290289454462745374
23 6108699653117045614