# A049137 (b-file synthesized from sequence entry)
1 1
2 1
3 2
4 6
5 22
6 88
7 370
8 1607
9 7150
10 32418
11 149246
12 695840
13 3278942
14 15591708
15 74721660
16 360540041
17 1750069638
18 8539926158
19 41869742140
20 206149706634
21 1018875856490
22 5053136206216
23 25140141786040
24 125436643981858