# A115868 (b-file synthesized from sequence entry)
2 1
3 1
4 1
5 1
6 2
7 2
8 4
9 6
10 11
11 18
12 39
13 70
14 153
15 321
16 721
17 1612
18 3792
19 8896
20 21498
21 52230
22 128994
23 320786
24 806582
25 2040912
26 5205311
27 13352470
28 34460430
29 89384609