# A179494 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 27
4 284
5 4110
6 77424
7 1818474
8 51692080
9 1738555344
10 67979689200
11 3047234077800
12 154810558674144
13 8829473686348848
14 560819284547110848
15 39398646866759606160
16 3043158904460954177280
17 257091879144869492997120