# A157457 (b-file synthesized from sequence entry)
0 0
1 3
2 16
3 125
4 1116
5 12943
6 182400
7 3080025
8 60524200
9 1357997531
10 34237168560
11 957927505717
12 29446184348868
13 986272776455415
14 35746439807927296
15 1393753996031259953
16 58165330905054360720
17 2586788074128361802419