# A127756 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 5
4 18
5 97
6 600
7 4325
8 35280
9 322578
10 3265920
11 36288097
12 439084800
13 5748019800
14 80951270400
15 1220496081125
16 19615115520000
17 334764638243280
18 6046686277632000
19 115242726703426578