# A049214 (b-file synthesized from sequence entry)
0 1
1 20
2 784
3 52352
4 5360256
5 782525952
6 154594381824
7 39746508226560
8 12902483299368960
9 5162443736924160000
10 2496471943395999744000
11 1435556519572510605312000
12 968234590214616380866560000