# A193160 (b-file synthesized from sequence entry)
1 1
2 2
3 9
4 68
5 760
6 11664
7 233828
8 5905696
9 182846592
10 6792372480
11 297550188672
12 15153482847744
13 886517886778368
14 58975120009537536
15 4422337095720648960
16 370957479138591903744
17 34576037926690499493888
18 3559813114275891217760256