# A151481 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 13
4 57
5 236
6 1106
7 5136
8 25112
9 123604
10 624229
11 3181337
12 16456910
13 85845734
14 452215297
15 2398829267
16 12815000375
17 68850087543
18 371908087035
19 2018269612417
20 10999942891088
21 60181126016328
22 330414426742222
23 1819877327401550
24 10053145748429452
25 55684213462489305
26 309204003830794592