# A168448 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 26
4 226
5 2395
6 29278
7 398499
8 5899534
9 93507783
10 1569405110
11 27672405800
12 509622262860
13 9759305238932
14 193673399146066
15 3972141366536794
16 84010899306559470
17 1829057795368804875
18 40931310532585505770
19 940322157062673670051
20 22152626055397162566438