# A145302 (b-file synthesized from sequence entry)
0 1
1 7
2 56
3 490
4 4508
5 42532
6 406112
7 3899224
8 37532432
9 361686640
10 3487250816
11 33630672544
12 324364881344
13 3128620091968
14 30177356271104
15 291080943932800
16 2807684251672832
17 27082179878242048
18 261227779725129728