# A203507 (b-file synthesized from sequence entry)
0 1
1 3
2 15
3 82
4 504
5 3198
6 21592
7 147570
8 1045221
9 7464052
10 54549804
11 400487997
12 2990765270
13 22396990002
14 169881957174
15 1291189065086
16 9910770901971
17 76178174174205
18 590312326353680
19 4578346159792815
20 35745960436892046
21 279290158338688617