# A168971 (b-file synthesized from sequence entry)
0 1
1 6
2 30
3 150
4 750
5 3750
6 18750
7 93750
8 468750
9 2343750
10 11718750
11 58593750
12 292968750
13 1464843750
14 7324218750
15 36621093750
16 183105468750
17 915527343750
18 4577636718750
19 22888183593750
20 114440917968750
21 572204589843750