# A045689 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 30
4 756
5 75600
6 7392
7 54486432000
8 4358914560
9 1905468364800
10 7602818775552000
11 6690480522485760000
12 4616431560515174400000
13 226851446883715670016000000
14 127036810254880775208960000
15 2210440498434925488635904000000
16 646080179971122507107008512000000