# A007853 (b-file synthesized from sequence entry)
1 1
2 2
3 5
4 15
5 50
6 178
7 663
8 2553
9 10086
10 40669
11 166752
12 693331
13 2917088
14 12398545
15 53164201
16 229729439
17 999460624
18 4374546305
19 19250233408
20 85120272755
21 378021050306
22 1685406494673
23 7541226435054
24 33852474532769
25 152415463629568
26 688099122024944