# A006663 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 2
4 8
5 12
6 52
7 86
8 400
9 710
10 3404
11 6316
12 30888
13 59204
14 293192
15 576018
16 2877184
17 5764430
18 28967428
19 58970568
20 297634344
21 614037754
22 3109111064