# A009682 (b-file synthesized from sequence entry)
0 0
1 2
2 8
3 168
4 6208
5 365984
6 31759232
7 3799039104
8 599327352832
9 120551382086144
10 30112348370954240
11 9144842254707320832
12 3318219571077818269696
13 1417778434388262802202624