# A155671 (b-file synthesized from sequence entry)
0 1
1 2
2 20
3 272
4 3440
5 40952
6 468560
7 5217032
8 56953280
9 612579512
10 6513215600
11 68618940392
12 717570463520
13 7458134171672
14 77123207545040
15 794108867905352
16 8146979811148160
17 83322818300333432
18 849905364703000880