# A219530 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 24
4 195
5 2046
6 26752
7 422546
8 7849611
9 167781117
10 4054557471
11 109246333917
12 3245641491658
13 105366022410057
14 3709933487122164
15 140791348680766521
16 5728108758307500165
17 248696925989154108462
18 11476424805495560002162
19 560894026563924188981599
20 28941826672247857117927894