# A148951 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 9
4 30
5 102
6 397
7 1500
8 6009
9 24451
10 101183
11 425673
12 1816275
13 7816634
14 34052901
15 149363641
16 660504469
17 2940315586
18 13164619889
19 59271046961
20 268144561326
21 1218435897550
22 5559533877874
23 25460075683483
24 117000817561805
25 539378629640900
26 2493853152959533
27 11562252045813059
28 53742395325404286