# A097681 (b-file synthesized from sequence entry)
0 1
1 6
2 36
3 216
4 1296
5 7776
6 47376
7 314496
8 2612736
9 28740096
10 368395776
11 4796983296
12 60300205056
13 750367328256
14 10151357239296
15 164475953381376
16 3110937349718016
17 61410199093641216
18 1174438559356747776