# A037690 (b-file synthesized from sequence entry)
1 1
2 8
3 48
4 291
5 1747
6 10484
7 62904
8 377427
9 2264563
10 13587380
11 81524280
12 489145683
13 2934874099
14 17609244596
15 105655467576
16 633932805459
17 3803596832755
18 22821580996532
19 136929485979192
20 821576915875155
21 4929461495250931