# A149453 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 13
4 49
5 197
6 812
7 3474
8 15158
9 67376
10 303459
11 1383358
12 6363572
13 29509269
14 137771543
15 646907907
16 3052952032
17 14470721920
18 68854163470
19 328735177885
20 1574256833505
21 7559227173640
22 36385912226315
23 175525189436472
24 848409828992201
25 4108222390467437
26 19925762711434817
27 96789429703804583