# A149621 (b-file synthesized from sequence entry)
0 1
1 1
2 5
3 15
4 65
5 247
6 1073
7 4429
8 19531
9 83855
10 374813
11 1646373
12 7436141
13 33160711
14 150961707
15 680557859
16 3116996709
17 14167970351
18 65200939457
19 298276795781
20 1378001669359
21 6336574350495
22 29368668897235
23 135618551033187
24 630280983790681
25 2920720543034943
26 13605821062219949
27 63235825225518767