# A284844 (b-file synthesized from sequence entry)
1 16
2 70
3 384
4 2534
5 19424
6 169254
7 1650160
8 17784646
9 209855856
10 2689946246
11 37210700576
12 552433526310
13 8759992172224
14 147751562532454
15 2641055171379984
16 49869279287055494
17 991843699479853520
18 20724299315437752006
19 453861919477920665536
20 10395594941305558134886