# A150897 (b-file synthesized from sequence entry)
0 1
1 2
2 8
3 34
4 156
5 718
6 3422
7 16334
8 79118
9 384020
10 1878350
11 9201068
12 45268796
13 223004070
14 1101463614
15 5445866142
16 26971500686
17 133688792364
18 663414638696
19 3294250138924
20 16371243474378
21 81401390498830
22 404986420868284
23 2015720354009970
24 10037249760011008
25 49997200939602922
26 249130467399797802