# A157856 (b-file synthesized from sequence entry)
0 1
1 15
2 56
3 1665
4 3080
5 45375
6 166376
7 9718545
8 8833160
9 127944225
10 461568296
11 13274709555
12 23784791240
13 339933981675
14 1211397511016
15 137818710619425
16 61120313133320
17 865798969339725
18 3061200012378536
19 86466681946098645
20 152460758526595400