# A043553 (b-file synthesized from sequence entry)
1 1
2 7
3 43
4 250
5 1420
6 7990
7 44800
8 250900
9 1404700
10 7864000
11 44026000
12 246481000
13 1379950000
14 7725850000
15 43254430000
16 242167300000
17 1355815600000
18 7590769900000
19 42498250000000
20 237933871000000
21 1332114307000000