# A163093 (b-file synthesized from sequence entry)
0 1
1 17
2 272
3 4352
4 69496
5 1109760
6 17721480
7 282988800
8 4518961080
9 72161899200
10 1152331158600
11 18401221627200
12 293843444945400
13 4692295538064000
14 74929823330517000
15 1196531288107632000
16 19107039891249747000
17 305114439575750760000
18 4872278582526960045000