# A027991 (b-file synthesized from sequence entry)
1 1
2 3
3 12
4 40
5 130
6 404
7 1227
8 3653
9 10720
10 31090
11 89316
12 254568
13 720757
14 2029095
15 5684340
16 15855964
17 44061862
18 122032508
19 336966015
20 927953705
21 2549229256
22 6987648358
23 19115124552
24 52194037200
25 142274514025
26 387215773899