# A257633 (b-file synthesized from sequence entry)
0 1
1 6
2 45
3 364
4 3060
5 26334
6 230230
7 2035800
8 18156204
9 163011640
10 1471442973
11 13340783196
12 121399651100
13 1108176102180
14 10142940735900
15 93052749919920
16 855420636763836
17 7877932561061640
18 72667580816130436
19 671262558647881200
20 6208770443303347920