# A307593 (b-file synthesized from sequence entry)
0 1
1 3
2 10
3 39
4 180
5 977
6 6156
7 44401
8 361872
9 3295025
10 33193284
11 366828033
12 4414938000
13 57501795977
14 805984165252
15 12098920460089
16 193676009792768
17 3293501718960033
18 59294599560573508
19 1126737323074730161
20 22536528123718353104
21 473290909667471110361