# A251580 (b-file synthesized from sequence entry)
0 1
1 1
2 10
3 280
4 13960
5 1023760
6 99935200
7 12226859200
8 1801725932800
9 310890328768000
10 61516405597830400
11 13735605457885312000
12 3416919943285809280000
13 937247149729410729472000
14 281051240591439955878400000
15 91474949907165746668607488000
16 32117399444469103248129863680000