# A047688 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 1
4 8
5 15
6 240
7 90
8 5760
9 5670
10 3628800
11 3150
12 14515200
13 48648600
14 4151347200
15 2554051500
16 20922789888000
17 43418875500
18 6402373705728000
19 34735100400
20 3283268567040000
21 623668727682000
22 34060628114472960000
23 306265893058125