# A347726 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 7
4 37
5 221
6 1801
7 15709
8 157641
9 1775521
10 21898801
11 296379931
12 4346295757
13 68682481141
14 1163591541113
15 21024039322441
16 403559222086801
17 8199021870113985
18 175746277620520417
19 3963144157484213359
20 93778090395227788021
21 2323080237693908254381