# A027108 (b-file synthesized from sequence entry)
0 1
1 5
2 16
3 50
4 152
5 452
6 1331
7 3897
8 11378
9 33186
10 96791
11 282461
12 825013
13 2412157
14 7060154
15 20686324
16 60673102
17 178126774
18 523426827
19 1539393889
20 4530901919
21 13345545959
22 39335284312
23 116011722730
24 342354698603